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Hi all,
The Royal Society has published a paper on Climate Change. It can be found here:
http://www.royalsoc.ac.uk/trackdoc.asp?id=1630&pId=4761
There was a nice discussion of the 2003 European Heat wave, (it was probably the hottest summer in Europe since at least 1500 AD). It has been estimated that the heat wave caused 22,000 to 35,000 deaths over what would have occurred in a cooler summer.
There is a very nice discussion of how hard it is to apply climate change to individual weather events and statistical trends in climate variability in page 10 of the above document.
See also:
Sahar, C., Vidale, P.L., Luthi, D., Frei, C., Haberli, C., Liniger M.A., and Appenzeller, C. 2004. The role of increasing temperature variability in European summer heatwaves. Nature, volume 427, pages 332 - 336.
Stott, P., Stone, D.A. and Allen M.R. 2004. Human contributions to the European heatwave of 2003. Nature, volume 432, pages 610 - 614.
I need not say, I hope, that Nature is one of the top scientific periodicals on the planet.
Warm regards, Rick.
RickSmith,
At a constant 10c 24/7/365 it would take a hundred years to melt to the ground of Greenland.
Hi Nickname,
Something else occurred to me. As I have made clear in previous posts I am taking the long view. Will the extinction event that is now started, accelerate? Will civilization survive? Will, by 2200, we have large scale H2S eruptions?
Saying that something will take 100 years does not make me say, "Oh, 100 years. I won't worry then." What it makes me say is: "Only 100 years!" I've had training as a geologist and I consider planetary changes in deep time.
Warm regards, Rick.
I have found more information on the temperature changes. It called the Great Global warming swindle - UK Channel 4.
Larry,
Hi Larry,
You have said some really, truly, remarkable things in several of your posts.
I found the "Great Global Warming Swindle to be amazing, and did some searches and found an article talking about the accuracy of it. Which I posted in full above to save you from having to search thru the URLs.
I was hoping that you would comment on this critism of this show you recommend as an accurate view of this very important subject.
A number of people have taken exeception to this data of yours.
http://www.realclimate.org/index.php/ar … 3/swindled
I found this line of particular interest:
Eight of the scientists in the film - John Christy, Paul Reiter, Richard Lindzen, Paul Driessen, Roy Spencer, Patrick Michaels, Fred Singer and Tim Ball - are linked to American neo-conservative and right-wing think-tanks, many of which have received tens of millions of dollars from Exxon.
Further information on how Exxon is funding those opposing global warming can be found here.
http://www.exxonsecrets.org/ index.php?mapid=831
// (click ‘Launch’ then click ‘skip intro’)
Perhaps you would like to comment on why Exxon is spending hundreds of millions of dollars opposing the Koyto accord?
When the quality of your sources is so truely awful, it makes everything that you say seem doubtful at best.
Regards, Rick
RickSmith,
I question the wisdom of any deep ice sheet melting over any short period of time.
At a constant 10c 24/7/365 it would take a hundred years to melt to the ground of Greenland. ...
Hi Nickname,
John Creighton asked if all the sun's energy was concentrated on Greenland how long would it take to melt. Usually I don't answer other people's homework / do calculations for them but I was curious and so I worked it out.
1.2 weeks to melt that much ice. A much, much more approximate value of 5.75 years to warm unrealistically cold ice to 0 so it is ready to melt.
Of course I KNOW that not all the sun's energy is going to Greenland. However, I was surprised how low those numbers actually were.
You quote 100 years to melt G.'s ice cap at 10c. I would be interested in seeing your calculations. The advantage, of course, of me showing all calculations and where I get my data is that trivial to double check me. Peer review & questioning assumptions is the essence of good science.
People will take what you say more seriously if you show your calculations / sources.
Warm regards, Rick.
This is from MediaLens which watchdogs mass media:
http://www.medialens.org/alerts/07/0313 … da_the.php
March 13, 2007
PURE PROPAGANDA - THE GREAT GLOBAL WARMING SWINDLE
The Scientists Are The Bad Guys
On March 8, Channel 4 screened The Great Global Warming Swindle, a documentary that branded as a lie the scientific consensus that man-made greenhouse gasses are primarily responsible for climate change.
The film was advertised extensively on Channel 4 and repeatedly previewed and reviewed in newspapers. Writing in the Sunday Telegraph, Christopher Booker declared:
“Only very rarely can a TV documentary be seen as a pivotal moment in a major political debate, but such was Channel 4's The Great Global Warming Swindle last Thursday. Never before has there been such a devastatingly authoritative account of how the hysteria over global warming has parted company with reality.” (Booker, ‘A turning point in climate change,’ Sunday Telegraph, March 11, 2007)
Peter Hitchens commented in the Daily Mail:
“If you were worried about those snaps of polar bears clinging to melting ice-floes, sentenced to a slow death by global warming, you may now relax. They'll be fine. Channel 4 has paid in full for its recent misdemeanours by screening, last Thursday, the brilliant, devastating film The Great Global Warming Swindle.” (Hitchens, ‘Drugs?’, Daily Mail, March 11, 2007)
Doubtless like many who saw the film, the Financial Times’ reviewer was left bewildered:
“Not so long ago, the venerable David Attenborough on the Beeb was telling us that human-driven global warming was real and was coming for us. So that was settled. Now Channel 4, like a dissident schoolboy, is scoffing at the old boy's hobbyhorse and I don't know what to believe.” (’Slaughterhouse three,’ Financial Times, March 10, 2007)
The film opened with scenes of wild weather and environmental disaster accompanied by dramatic captions:
"THE ICE IS MELTING. THE SEA IS RISING. HURRICANES ARE BLOWING. AND IT’S ALL YOUR FAULT.
“SCARED? DON'T BE. IT'S NOT TRUE."
This was immediately followed by a series of equally forthright talking heads:
"We can't say that CO2 will drive climate; it certainly never did in the past."
“We imagine that we live in an age of reason. And the global warming alarm is dressed up as science. But it’s not science; it’s propaganda.”
And:
“We’re just being told lies; that’s what it comes down to.”
The commentary added to the sense of outrage: “You are being told lies.”
This was indeed superficially impressive - when several experts make bold statements on the same theme we naturally assume they must be onto something - but alarm bells should already have been ringing. This, after all, was ostensibly a film about science - about evidence, arguments, research and debate. Why, then, the language of polemic and smear?
The remarkable answer is provided by the film’s writer and director, Martin Durkin:
"I think it [the film] will go down in history as the first chapter in a new era of the relationship between scientists and society. Legitimate scientists - people with qualifications - are the bad guys. It is a big story that is going to cause controversy.
“It's very rare that a film changes history, but I think this is a turning point and in five years the idea that the greenhouse effect is the main reason behind global warming will be seen as total bollocks.” ('“Global Warming Is Lies” Claims Documentary,’ Life Style Extra, March 4, 2007; www.lse.co.uk/ShowStory.asp?story=CZ434669 U&news_headline=global_warming_is_lies_ claims_documentary)
Compare and contrast this with the aim as described in a letter sent by the makers of the film, Wag TV, to Professor Carl Wunsch, a leading expert on ocean circulation and climate who subsequently appeared in the film:
“The aim of the film is to examine critically the notion that recent global warming is primarily caused by industrial emissions of CO2. It explores the scientific evidence which jars with this hypothesis and explores alternative theories such as solar induced climate change. Given the seemingly inconclusive nature of the evidence, it examines the background to the apparent consensus on this issue, and highlights the dangers involved, especially to developing nations, of policies aimed at limiting industrial growth.” (http://ocean.mit.edu/~cwunsch/papersonl … l4response)
Wunsch comments:
"I am angry because they completely misrepresented me. My views were distorted by the context in which they placed them. I was misled as to what it was going to be about. I was told about six months ago that this was to be a programme about how complicated it is to understand what is going on. If they had told me even the title of the programme, I would have absolutely refused to be on it. I am the one who has been swindled." (Geoffrey Lean, ‘Climate change: An inconvenient truth... for C4,’ The Independent, March 11, 2007; http://news.independent.co.uk/environment/ climate_change/article2347526.ece)
We will hear more from Wunsch in what follows.
Deeply Deceptive
The film presented viewers with an apparently devastating refutation of the "theory of global warming". And these were not picky, esoteric criticisms. Durkin insisted that the world’s climate scientists are guilty of the most fundamental error imaginable: increased atmospheric carbon dioxide (CO2) is not the cause of higher temperature, as the experts claim. Quite the reverse: increasing atmospheric CO2 is itself the result of rising temperature.
As evidence for this contention, Durkin argued that global surface temperature dropped dramatically between 1945-1975, at a time when CO2 emissions were rapidly rising as a result of the postwar economic boom. According to Durkin, if CO2 emissions were responsible for increasing temperature, then temperature should not have fallen between 1945-1975. Clearly, then, some factor other than CO2 emissions must have caused the subsequent global temperature rise.
But Real Climate, an internet site run by climate scientists, such as NASA’s Dr Gavin Schmidt and Dr William Connelley of the British Antarctic Survey, describes Durkin’s discussion of the 1945-75 period as “deeply deceptive”. (Real Climate, March 9, 2007; www.realclimate.org/index.php/ archives/2007/03/swindled)
In this section of the film, Durkin focused heavily on a graph depicting temperature changes. The graph, Real Climate comments, “looks rather odd and may have been carefully selected”. It appears to show a dramatic cooling between the 1940s and 1970s. But try flipping between the film’s version of the global temperature record (shown above left) and the temperature plot that normally appears in the scientific literature (shown above right) The supposed cooling looks rather less evident in this second graph.
Without knowing more details of how Durkin may have manipulated the data plotted in his graph, it is difficult to comment on the presentation. What we can say is that Durkin’s "four decades of cooling", implying a relentless temperature drop over 40 years, is not an accurate description of the trend over this period. There was some cooling for +part+ of this time but also some plateauing, with fluctuations up and down.
But why did the temperature not simply rise in line with the post-war increase in greenhouse gas emissions?
In fact, as is well-known, the absence of a global rise in temperature between 1945-75 is explained by the release of large amounts of industrial pollutants, called sulphate aerosols, into the atmosphere. These particles have a braking effect on global warming, known as “global dimming”. By shielding some of the incoming solar energy, sulphate aerosols mask the underlying warming effect generated by rising levels of CO2. By the 1980s, however, stronger warming had exceeded this masking effect and global temperature has since continued to rise. As Real Climate notes, by failing to explain the science behind this phenomenon the programme makers were guilty of “lying to us by omission.”
The Ice Cores
The film repeatedly gave the impression that mainstream science argues that CO2 is the sole driver of rising temperatures in the Earth's climate system. But this is not the case. Climate scientists are well aware that solar activity plays a role, though a minor one at present, as do long-term periodic changes in the Earth's orbit, known as Milankovitch cycles. (See: http://en.wikipedia.org/ wiki/Milankovitch_cycles)
The point is that there is a vast body of evidence that very strongly supports the hypothesis that greenhouse gas emissions, of which CO2 is the most important, are primarily responsible for recent global warming. The 4th and most recent scientific assessment of the Intergovernmental Panel on Climate Change (IPCC) concludes:
"Most of the observed increase in globally averaged temperatures since the mid-20th century is very likely [.i.e. probability greater than 90%] due to the observed increase in anthropogenic greenhouse gas concentrations." ('Climate Change 2007: The Physical Science Basis,' Summary for Policymakers, IPCC, February 2007, page 10; www.ipcc.ch/SPM2feb07.pdf)
We then come to one of the film's most misleading arguments. Antarctic ice cores show that rises in levels of CO2 have lagged 800 years behind temperature rises at specific times in the geological past. This, argued Durkin, +proves+ that CO2 cannot be responsible for global warming - instead global warming is responsible for increasing levels of CO2. But this was a huge howler.
What Durkin's film failed to explain was that the 800-year lag happened at the end of ice ages which occur about every 100,000 years. (See: www.realclimate.org/index.php/ archives/2004/12/co2-in-ice-cores)
Scientists believe that the end of an ice age is likely triggered when the amount of heat reaching the Earth rises as a result of a periodic change in the Earth's orbit around the sun. Jeff Severinghaus, Professor of Geosciences at Scripps Institution of Oceanography, explains why the rise in CO2 initially lags behind the temperature rise:
"The reason has to do with the fact that the warmings take about 5000 years to be complete. The lag is only 800 years. All that the lag shows is that CO2 did not cause the first 800 years of warming, out of the 5000 year trend." (Real Climate, 'What does the lag of CO2 behind temperature in ice cores tell us about global warming?’, December 3, 2005; www.realclimate.org/index.php /archives/2004/12/co2-in-ice-cores/)
The best current explanation for the lag of 800 years is that this is how long it takes for CO2, absorbed by the ocean in an earlier warm period, to be "flushed out" at the end of an ice age. Once that CO2 has been released into the atmosphere its heat-trapping properties as a greenhouse gas lead to even stronger warming: an example of positive feedback. (See Caillon et al., 'Timing of Atmospheric CO2 and Antarctic Temperature Changes Across Termination III,' Science, 14 March 2003: Vol. 299. no. 5613, pp. 1728 - 1731)
Professor Severinghaus summarises:
"In other words, CO2 does not initiate the warmings, but acts as an amplifier once they are underway."
Durkin’s analysis, then, was way off the mark.
The film’s claim that solar activity might account for recent warming is also without credibility. In September 2006, the Times reported the latest findings from researchers writing in the top journal, Nature:
“Scientists have examined various proxies of solar energy output over the past 1,000 years and have found no evidence that they are correlated with today's rising temperatures. Satellite observations over the past 30 years have also turned up nothing. ‘The solar contribution to warming... is negligible,’ the researchers wrote in the journal Nature.” (Anjana Ahuja, ‘It's hot, but don't blame the Sun,’ The Times, September 25, 2006)
The film's other scientific claims can be similarly dismissed. Carl Wunsch - who, as discussed, appeared in the film - comments:
“What we now have is an out-and-out propaganda piece, in which there is not even a gesture toward balance or explanation of why many of the extended inferences drawn in the film are not widely accepted by the scientific community. There are so many examples, it's hard to know where to begin, so I will cite only one: a speaker asserts, as is true, that carbon dioxide is only a small fraction of the atmospheric mass. The viewer is left to infer that means it couldn't really matter. But even a beginning meteorology student could tell you that the relative masses of gases are irrelevant to their effects on radiative balance. A director not intending to produce pure propaganda would have tried to eliminate that piece of disinformation.” (http://ocean.mit.edu/~cwunsch/ papersonline/channel4response)
For further help in understanding the weakness of the film’s claims, see the following resources:
Real Climate, 'Swindled',
http://www.realclimate.org/index.php/ar … 3/swindled
Campaign Against Climate Change, including a rebuttal to the film by Sir John Houghton, who chairs the Scientific Assessment Working Group of the Intergovernmental Panel on Climate Change: http://portal.campaigncc.org/node/1820
Royal Society: Facts and fictions about climate change:
http://www.royalsoc.ac.uk/page.asp?id=4761
“I Was Duped” - Déjà Vu?
Many readers will be aware that Durkin has previous ‘form’. In 1997, Channel 4 broadcast his three-part series, Against Nature, which suggested present-day environmentalists were the true heirs of the Nazis. (See George Monbiot, ‘The Revolution Has Been Televised,’ The Guardian, December 18, 1997; www.monbiot.com/archives/1997/ 12/18/the-revolution-has-been-televised/)
Several interviewees who appeared in the film felt they had been misled about the programme-maker’s agenda. Responding to complaints, the Independent Television Commission (ITC) found that the editing of interviews with four contributors had "distorted or misrepresented their known views". (Geoffrey Lean, ‘Climate change: An inconvenient truth... for C4,’ The Independent, March 11, 2007; http://news.independent.co.uk/ environment/climate_change/article2347526.ece)
In addition, the ITC found: "The interviewees had also been misled as to the content and purpose of the programmes when they agreed to take part." (Paul McCann, ‘Channel 4 told to apologise to Greens,’ The Independent, April 2, 1998)
Ten years on, it appears that history may have repeated itself. In his letter of complaint to the film-makers cited above, Carl Wunsch writes:
“I have some experience in dealing with TV and print reporters and do understand something of the ways in which one can be misquoted, quoted out of context, or otherwise misinterpreted. Some of that is inevitable in the press of time or space or in discussions of complicated issues. Never before, however, have I had an experience like this one. My appearance in the ‘Global Warming Swindle’ is deeply embarrassing, and my professional reputation has been damaged. I was duped---an uncomfortable position in which to be.
“At a minimum, I ask that the film should never be seen again publicly with my participation included. Channel 4 surely owes an apology to its viewers, and perhaps WAGTV owes something to Channel 4. I will be taking advice as to whether I should proceed to make some more formal protest.” (http://ocean.mit.edu/~cwunsch/ papersonline/channel4response)
Eight of the scientists in the film - John Christy, Paul Reiter, Richard Lindzen, Paul Driessen, Roy Spencer, Patrick Michaels, Fred Singer and Tim Ball - are linked to American neo-conservative and right-wing think-tanks, many of which have received tens of millions of dollars from Exxon.
Greenpeace provides a fascinating online ’map’ detailing how Exxon funds these climate sceptics. Go to: http://www.exxonsecrets.org/ index.php?mapid=831 (click ‘Launch’ then click ‘skip intro’)
In his book, Green Backlash, environmental journalist Andrew Rowell noted that Fred Singer has also attacked scientific and environmental stances on other green issues such as ozone, acid rain, automobile emissions and even whaling. Singer has worked for companies such as Exxon, Shell, Arco, Unocal and Sun.
According to the Environmental Research Foundation, a non-governmental organisation:
“For years, Singer was a professor at the University of Virginia where he was funded by energy companies to pump out glossy pamphlets pooh-poohing climate change.” (Quoted, Sharon Beder, Global Spin, Green Books, 1997, p.94)
Rowell wrote that a quarter of Patrick Michaels’ research funding was reportedly received from companies such as Edison Electric Institute, the largest utility trade association in America. Michaels’ magazine, World Climate Review, was funded by the Western Fuel Association and a video produced by him was funded by coal companies and distributed by the Denver Coal Club. (Rowell, Green Backlash, Routledge, 1996, p.143)
Both Singer and Michaels represented the fossil fuel lobby’s Global Climate Coalition and the Competitive Enterprise Institute, a leader in global warming scepticism.
Journalist Ross Gelbspan noted that in May 1995, Richard Lindzen and Patrick Michaels were hired as expert witnesses to testify on behalf of Western Fuels Association, a $400 million consortium of coal suppliers and coal-fired utilities. Gelbspan said of Lindzen:
“I don't know very many supporters of Mr Lindzen who are not in the pay of the fossil fuel lobby. Dr Lindzen himself, his research is publicly funded, but Dr Lindzen makes, as he told me, $2,500 a day consulting with fossil fuel interests, and that includes his consulting with OPEC, his consulting with the Australian coal industry, his consulting with the US coal industry and so forth. That's not to say Dr Lindzen doesn't believe what he says, but it is to say that he stands in very sharp distinction to really just about virtually all of the climate scientists around the world.” (Tony Jones, ‘Journalist puts global warming sceptics under the spotlight,’ Australian Broadcasting Corporation, March 7, 2005; www.abc.net.au/lateline/ content/2005/s1318067.htm)
Journalist George Monbiot wrote of Philip Stott:
“Professor Stott is a retired biogeographer. Like almost all the prominent sceptics he has never published a peer-reviewed paper on climate change. But he has made himself available to dismiss climatologists' peer-reviewed work as the ‘lies’ of ecofundamentalists.” (Monbiot, ‘Beware the fossil fools,’ The Guardian, April 27, 2004; http://environment.guardian.co.uk/ climatechange/story/0,,1829315,00.html)
Paul Driessen is a fellow at two right-wing think tanks in the US, which are part of the Wise Use movement. One of the think tanks is headed by Ron Arnold, who has spent the last twenty years attacking the environmental movement. His fellow director is a fundraiser for America's gun lobby. The list goes on...
By contrast, Greenpeace spokeswoman Mhairi Dunlop said her organisation had been interviewed by Durkin but none of the material had been included in the film:
"They interviewed us but I guess what we said didn't fit in with the [story] they were peddling." (McCandless, op. cit)
Following the film’s broadcast, Professor Martin Rees, president of the Royal Society - the government-sponsored academy of sciences for the United Kingdom - has said that many factors contribute to global warming but it is clear that emissions of "greenhouse gases," particularly CO2, are to blame for most of the current temperature rise. Rees added:
"Those who promote fringe scientific views but ignore the weight of evidence are playing a dangerous game. They run the risk of diverting attention from what we can do to ensure the world's population has the best possible future." (Ibid)
On March 11 the Observer published a letter from a group of climate scientists responding to Durkin’s film:
“This programme misrepresented the state of scientific knowledge on global warming, claiming climate scientists are presenting lies. This is an outrageous statement...
“We defend the right of people to be sceptical, but for C4 to imply that the thousands of scientists and published peer-reviewed papers, summarised in the recent international science assessment, are misguided or lying lacks scientific credibility and simply beggars belief.” (Alan Thorpe, Natural Environment Research Council, Brian Hoskins, University of Reading, Jo Haigh, Imperial College London, Myles Allen, University of Oxford, Peter Cox, University of Exeter, Colin Prentice, QUEST Programme, letter to the Observer, Sunday March 11, 2007;
http://observer.guardian.co.uk/ letters/story/0,,2031117,00.html)
Viewed from one perspective, Channel 4 has done a huge public disservice in spreading absurd and mendacious arguments guaranteed to generate confusion. This at a time when a fragile momentum is building on the need to take urgent action on the very real threat of catastrophic climate change.
But from another perspective it may well be that this film does for climate scepticism what Tony Blair’s “dodgy dossiers” did for the pro-war movement ahead of the invasion of Iraq. Wildly distorted propaganda often does have a powerful initial impact. But stretched beyond a certain point of unreality, it also has a tendency to turn on, and bite, the propagandists.
Durkin’s grandiose prediction that his film “will go down in history” will surely prove correct, although perhaps not for the reasons he imagined.
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Simply amazing.
Warm regards, Rick.
For whoever voted for the last choice on the pole would you like to do a calculation on how long it would take for the Greenland ice cap to melt if all the power from the sun when into melting the ice in Greenland? I havn’t done it yet, I think it would be fun.
Hi John,
The sun produces so much energy that it would take less than a second to flash the entire mass of the Greenland ice sheet from a solid block of ice to a plasma. Goes to show the power of a fusion reactor 150 million km away. Or perhaps you just meant the energy of the sun that hits the Earth? That is a harder problem which I will do for you to 2 significant decimal places.
The sun produces a tremendous amount of energy - 1300 Watts / m^2 at the Earth's orbit. (One Watt is a joule of energy each second.) (This information I got from page 71 of "Entering Space" by Robert Zubrin.)
The diameter of the Earth is 12.756.3 km. Thus the area of the light and heat intercepted (assuming the earth is a sphere) is 1.278 E8 km^2
Thus the energy intercepted each second is: 1.66 E17 Joules !
The volume of the Greenland ice sheet is approximately: 3.57 E18 cubic meters.
The Enthapy of Fusion of water is: 335.5 kj / kg.
(One cubic meter of ice is about equal to one tonne. 2 sigs, remember.)
So the ice masses about 3.57 E 21 kg and will require 1.20 E21 kj of heat to melt it.
1.2 E21 kj = 1.2 E24 joules of energy are needed.
1.2 E24 joules / 1.66 E 17 joules per second = 7.22 E 6 seconds.
So we will need 7.22 million seconds of the suns energy (which hits the Earth) to melt the Greenland ice sheet. This is equal to 8.35 days. ( Call it 1.2 weeks ).
This is the answer to your question.
Now someone might claim that I'm pulling a fast one on you. That is just what is needed to MELT the ice. But the ice has to be warmed to 0 C first.
I found it hard to get the temperature of the deep ice (mainly because it varies). How ever a very interesting article on Ice Cores on Wikipedia suggests to me that -20 C might be a good temperature for deep Antarctic ice. To be safe, I will assume that all the ice is at -40 C (this is almost certainly too cold since a significant fraction of the ice is close to 0 C & in any case the Greenland ice is not as cold as that of Antarctica.) Anyway, using the Specific Heat Capacity for ice and assuming VERY cold ice:
2.114 joules / gram / kelvin we get 2.114 E6 j tonnes (x 40 K ) joules per tonne (1 tonne = 1 cubic meter) of Greenland Ice; this equals 8.456 E7 J / m^3 for very cold Greenland ice.
So 3.57 E18 m^3 of ice * 8.456 E 7 J / m^3 (specific heat) = 3.02 E26 joules.
3.02 E 26 J / 1.66 E 17 J/sec = 1.82 E 9 seconds to warm the ice.
This is ~21,000 days or 5.76 years.
(By the way, if any one can find a good average temperature for deep Greenland ice please let me know & I will recalcuate this & edit this post. Give references.)
So if some loudly challenges your 1.2 week figure you can point out that if you want to warm the ice to melting it will take a few more years of the sun's energy. It is important to be accurate in these debates.
So you are right John, when you look at the next 200 or 500 years a trivial amount of time is needed to melt the ice cap to nothing.
While researching these calculations, I found a few interesting facts:
If ALL of the Greenland ice cap melts the seas will rise 7.2 meters. (Why the huge variation of estimates of the amount of sea level expected to rise in the next 100 or 200 years? Likely because people expect most but not all of the ice to melt.)
If the Antarctic ice sheet melts the sea level will rise about 61.1 meters.
(This is pretty bleak if you consider how much farm land will be destoyed if the sea level rises only one meter.)
In Greenland, 40% of the ice is currently being lost by calving from glaciers. In Antarctica 80 to 90% of the loss is from calving.
Greenland has 1.7 E6 km^2 of ice and in Antarctica this is about 14 E6 km^2. Both ice sheets average slightly more than 2 km thick.
The places where I got my figures from are below.
http://www.nasa.gov/vision/earth/lookin … slide.html
http://en.wikipedia.org/wiki/Ice_sheet
http://edmall.gsfc.nasa.gov/99invest.Si … d-ice.html
http://en.wikipedia.org/wiki/Specific_heat_capacity
http://en.wikipedia.org/wiki/Standard_e … _of_fusion
http://en.wikipedia.org/wiki/Ice_core
Warm regards, Rick.
Bush team takes heat over global warming science - Accusations of meddling
By Lucy Sherriff
Published Tuesday 20th March 2007 16:09 GMTThe Bush administration has been meddling in climate research in a bid to downplay the importance of global warming, according to a memo released by the US House Committee on Oversight and Government Reform.
The committee held its second hearing on federal interference in climate change science on Monday this week.
In his opening statement, representative Henry Waxman said although it is too early to draw firm conclusions about the White House's conduct, "some of the information the committee has already obtained is disturbing. It suggests there may have been a concerted effort directed by the White House to mislead the public about the dangers of global climate change".
He said that science should inform policy, and that if the Bush administration had turned this policy upside down "through raw political pressure, then it set our country on a dangerous course".
A memo later released by the committee says that the documents provided by the Council on Environmental Qualify (CEQ) suggest the White House was systematically trying to minimise the significance of climate change.
It says there is evidence that Phillip Cooney, former chief of staff of the CEQ, and his staff made almost 300 edits to a 10 year strategy document either to emphasise scientific uncertainty (181), or to diminish the human role in global warming (113).
It also cites evidence that the White House "played an active role in deciding when federal climate change scientists could answer media questions about their work".
James Hansen, director of the NASA Goddard Institute for Space Studies in New York, said he had seen a gradual politicising of science over the past quarter of a century, but that in 30 years in government he has "never seen anything approaching the degree to which information flow from scientists to the public has been screened and controlled as it has now".
He has previously accused political appointees within NASA of trying to censor him.
In his own testimony, Cooney describes his editing as part of "the normal review process" of documents moving between different agencies.
He writes: "I had the authority and responsibility to review the documents in question...and did so using my best judgement, based on the administration's stated research priorities...I understand that my judgement and the administration's priorities are properly open to review."
You can read the memo and all the written testimony here.
http://oversight.house.gov/story.asp?ID=1214
®
The man in hot water, Phil Cooney, was appointed as Chief of Staff at the Council on Environmental Quality. This is the ministry charged with protecting the environment in the USA. Interestingly enough, Phil Cooney was a former lobbyist for the Oil Industry. He has no background in ecology, toxicology, meteorology (or any science background at all).
In the report that is linked to above there is evidence of threats made to scientists who wished to speak an inconvenient truth. (Reprimands and budget cuts to their work and their colleagues work.) Sad reading really.
Bizarrely, this [20% cut to NASA's Earth Science budget] is happening just when NASA data are yielding spectacular and startling results. Two small satellites that measure the Earth's gravitational field with remarkable precision found that the mass of Greenland is now decreasing by about 150 cubic kilometers of ice per year and the West Antarctica by a similar amount. The area of the ice sheets with summer melting has increased markedly, major ice streams (portions of the ice sheet moving the most rapidly towards the ocean and discharging icebergs) have increased doubled in flow speed, and the are of the Arctic Ocean with summer sea ice has decreased 20 percent in the last 25 years.
One way to avoid bad news: stop the measurements! Only hitch: the first line of NASA mission is "to understand and protect our home planet." Maybe that can be changed to "...protect special interests' backside."
It is no wonder with this sort of lying going on by appointed public officials that people seem to think that there is not a scientific consensus on Climate Change.
Also of vital interest as it contradicts Tom's assurances:
The data shows that the Earth's climate has considerable inertia, due especially to the massive oceans and ice sheets. Yet the climate can change dramatically on century time scales and even on decadal and shorter time scales.
The evidence confirms a predominance of positive feedbacks that amplify climate response on short time scales, these feedbacks including increasing atmospheric water vapor and decreasing sea ice cover as the planet becomes warmer. However, the data also indicate the presence of feedbacks on decadal, century and longer time scales. These feedbacks include movement of forest and other vegetation poleward as the climate warms, increasing net emissions of greenhouse gases from the ocean and biosphere, and decrease in the area and brightness of ice sheets.
The predominance of positive feedbacks, along with the inertia of the oceans and ice sheets, has profound practical implications. It means that if we push the climate system hard enough it can obtain a momentum, it can pass tipping points, such that climate changes continue out of our control. Unless we begin to slow down the human-made climate forcings, there is the danger that we will create a different planet, one far outside the range that has existed in the course of human history (References 7, 8, 9).
It is because of these climate feedbacks and the inertia of the ocean and ice sheets that the global warming problem differs fundamentally from the problem of conventional air pollution (Reference 12). By the time the public can clearly see the existence of climate change, there is momentum in the system for a great deal of additional change. As a result we are probably already very near, if not beyond, the dangerous level of interference with atmospheric composition. ...
Dr. Hansen also questions the constitutional legality of the actions of the Executive Branch on this issue as the research is publicly funded by the congress (not funded by the executive branch) and therefore the public has the right to the uncensored information.
Warm regards, Rick.
Hi all,
The problem with "Mars: A Warmer Wetter Planet" is that most people and most libraries don't have it. (Ask your local library to get a copy!) However on page 10 of "National Geographic" Jan 2004 they have a orbital picture of what looks like a martian rock glacier complete with flow lines and talus piles at the bottom.
Warm regards, Rick
The IPCC 4AR Summary for Policymakers is available here
This is a highly complex and specialized matter, even this so called summary is hard to read. To give but one example of how easy it is to be completely mislead by the alarmist media, let's take your statement below:
Here is something I'm worried about but which does not get the press that 5 meter rises in sea levels does...
Check page 7 of the above report, 2nd to last paragraph:
The total 20th century rise (Global average sea level) is estimated to be 0.17 [0.12 to 0.22] m.
Now look at the scenarios in table SPM-3 on page 13 and take the most extreme case - the A1FI scenario - that estimates a yearly increase of 5.9 mm which would add up to 0.59m over the whole of the 21st Century. The press has exaggerated the rise in sea level by a factor of ten! BTW the low end of all but one of the other scenarios would fall below the maximum estimated sea level rise (0.22m) that has already occurred in the 20C without any serious global consequences.
Furthermore both the way the IPCC has summarized the science and the "science" itself have been strongly disputed. The media have failed to do their job, they are not reporting on the facts, they are distorting them.
Hi Clclops,
Thank you very much for quoting the data!!! It makes a nice change and I really appreciate it.
The report is very careful to explain what it is measuring. The Sea level rises include the warming water (which takes up more space so it expands), Increased run off from Glaciers and the Greenland Ice Cap & increased run off from the Antarctic Ice sheet. (From Table SPM-1 on page 7.)
However, Table SPM-3 on page 13 which you mentioned has the following heading which you did not quote: Sea level rise (m at 2090 to 2099 relative to 1980 - 1999) : Model based range excluding future rapid dynamical changes in ice flow.
Most of the news reports I've seen that speak of sea levels rising 3 to 5 meters also talk about the break up of the Greenland or Antarctic ice caps. The model that says that the oceans will rise from 0.26 to 0.59 meters are explicitly excluding this possibility. The ice cap on Greenland (or Antarctica) breaking up is a "future rapid dynamical change to the ice flow."
Why are they excluding this chance? I am guessing here, but I think it is because it is very hard to say when it will happen. They don't know if it will happen in 30 years, 60 years or 150 years. With out knowing, they predict the trends that can be estimated with some precision and do not go into sudden, hard to predict shifts to the world status. I think this is good science.
From what I have seen, I think that there is a good chance that the Greenland ice cap is less stable than you might wish. I saw a discovery channel TV show on Global Warming and it showed this video of a small river of fresh water on the surface of Greenland flowing over the ice and then diving vertical into this well that goes straight to the bottom of the ice cap. As more fresh water squeezes under that ice cap, the whole thing becomes much less stable. There were also graphs showing the amount of fresh water under the cap and the fresh water steadily expanded over the decades that the scientists have been studying this.
The Antarctic ice sheet are likely to remain stable for some time. It is showing none of these dangerous indicators.
Now you may say, "Some times the media says, we will get this huge rising of sea level because of Global Warming" but they don't say that "...this includes melting Greenland and or the West Shelf of Antarctica". True. Very True.
It would be much better for the media to say: "Sea levels will rise 20 to 50 cm, unless Greenland melts in which case it will be 4 or 5 meters, and if part of Antarctica melts too then it will be another 4 or 5 meters."
However, I don't see that happening soon.
But I saw two editorials in my local papers in the last week that say that scientists are divided on if Global Warming is even happening. As the AAAS quote says above, this is not the case. Of the all the papers written by people in the field, (excluding ones by the oil industry et all), 100 percent said that we were experiencing global warming and that humans were very likely to be contributing to this. (Some expressed no opinion and are excluded from this percentage.) But no reports, NONE, said that they thought that we were not experiencing warming and that humans were not partially responsible for this. Do you know how rare it is to get hundreds of scientific studies and not to get some data or people who go against the grain?
So despite an almost unprecedented amount of agreement from scientists editorials and opionion makers are saying that scientists don't agree after all.
So I have some bones to pick with the media as well. I would call them the strangly inaccurate, complacent media.
Finally, to Terraform Mars is a process I see taking hundreds of years. I want human culture on Earth to be vibrant, in an healthy ecology, 100, 200 and even 300 years from now. Mars might well need Earth that long.
So I am disturbed when I see people say, "Oh, nothing much will happen for 50 years. That's longer than I will be around. Screw the future."
Admittedly it is rare for someone to take the long view like I do, but as people interested in Terraforming, I think WE should take the long view.
And my long view is that humans are killing so many species we are in the middle of a major extinction event. Climate Change & desertification will likely increase the number of species lost. It takes millions of years to get back this biodiversity, this is 'bio-capital' we are throwing away.
Here is another quote:
Continued greenhouse gas emissions at or above current rates would cause further warming and induce many changes in the global climate system during the 21st century that would be VERY LIKELY be larger than those observed during the 20th century.
In my home province of BC we have the pine bore beetle. It looks to cost us a couple billion dollars over the next few years because we have not had a winter cold enough to kill these bugs in over 2 decades. BC and Washington state are losing a huge amount of money from economically valuable species because we are not getting the cold winters we need.
If things are noticeable in the 20th century and are very likely worse in the 21st century what are things going to be like in the 22nd century? As I say, I take the long view.
And my long view is that we better get to Mars in a hell of a hurry and get it terraformed. Because in 200 years Earth is going to have a lot of hungry, battered people fighting for a lot smaller area of food production. The American bread basket will be a desert because the USA seems to be unable to regulate how fast they are pumping out their aquifers. 200 years from now (and the years leading up to it) look scary to me.
After 200 years, it is hard to say where we will be. But if we decide to burn all our coal, then in 300 years we will have CO2 levels higher than some of the extinction events thought to be caused by Hydrogen Sulfide eruptions.
I don't know about you but I don't want the human race to be gone in a half a millennium. I think that is where we are heading with this global warming.
There is a very good book called, "Collapse" by Jered Diamond which looks at a whole bunch of cultures that have over extended themselves beyond what their environment can take. Things fall apart very quickly: war, famine, plague and death.
Let us say that my 500 year prediction is alarmist. In 20 years we get fusion (even tho funding for it has been dropping) and it does not go the way of MHD (now Magnetoplasmadynamics) power-plants and fission power-plants. And let us further assume that China and India DON'T build tonnes of coal burning plants. Well in those cases we don't need to worry.
But I don't see any of those things happening. I am dismayed by the slow progress of fusion and I know damn well that fossil fuels are a VERY HIGH DENSITY ENERGY SOURCE. I have never seen any society anywhere, anytime in history, wean itself off a high density energy source.
And there are trillions of dollars to be made by the oil, gas and coal industries if they can delay the adoption of fission and fusion by just 50 years, 100 years, 200 years. There will be organized resistance to change.
The vast resistance I see to even the simple proposition that most scientists think that humans are warming the planet is an example. Currently in the poll I set up at the start of this thread, we have 1 person (me) who is very worried about Climate Change, 1 person who says "Ya, it's a problem but not for me. I'll let my grand kids deal with it." (What a sweety.) And the other 3 people say that they don't think there is scientific consensus, think it is a myth that there is even any EVIDENCE for global warming or are content to wait until scientists come around to their point of view!
Well folks, my claim is this. I think that historically the wealth & ability to go to Mars is pretty damn rare. I think if our current Western civilization collapses it will be a lot harder for these events to ever happen again simply because we have used up so many of the easily accessible oil deposits. (Which are a concentrated energy source par-excellence & you NEED easily accessible concentrated energy sources to develop a high tech-society.) The rate that species are dying off now is equal to during a major extinction event and that will increase for various reasons well into the 21st century. As eco-systems get simpler they get less stable. (This includes economically valuable species and food species which we are mono-culturing which makes them doubly vulnerable.) I think we could easily have a collapse of our civilization in 300 years. I think we could easily see the human species go extinct in 500 to 1000 years, IF we keep pumping CO2 into the air for another 200 years.
Now I am well aware that most people are not worried about these things. But you will understand why I am not much moved by people who say, "Oh, won't be a problem for another 50 years or 100 years. I just won't worry about it, 'cause I've got gasoline to burn."
Warm regards, Rick.
Hi Karov,
I looked up SiF4 and you are right, it is a gas. Wow! I'm impressed that you know that off the top of your head. The line about silicon oxide rocks --> silicon fluoride rocks was cribbed from "World Building" by Stephen L. Gillett and was mainly given as an example of how oxidizing fluorine is.
I bow to your chemisty geeki-ness!
Warm regards, Rick.
Hi Everyone,
This report took a lot of hunting down to find but I have a got a web readable summary of the IPCC Third Assessment Report: Climate Change 2001. (They are currently working on the 4th report which is due out in 2007. My understanding is that the 4th report is now done and is now undergoing peer review to check facts.)
The IPCC (the Intergovernmental Panel on Climate Change) was founded by the World Meteorological Organization in order to:
"...to assess on a comprehensive, objective, open and transparent basis the best available scientific, technical & socio-economic information on climate change from around the world. The assessments are based on information contained in peer-reviewed literature and, where appropriately documented, in industry literature and traditional practices. They draw on the work of hundreds of experts from all regions of the world."
Anyway, the 34 page summary is at:
http://www.ipcc.ch/pub/un/syreng/spm.pdf
Some quotes of interest to this thread:
There is new and stronger evidence that most of the warming observed over the last 50 years is attributable to human activities.
The IPCC is saying this as well. All the major meterological groups are saying this. Scientific debates are dull if they ALL say the same thing...
Human activities have increased the atmospheric concentrations of greenhouse gases and aerosols since the pre-industrial era.
Note that there are no weasle words here. No "might have increased" or "strong possibility that...". Just "have increased".
The Earth's climate system has demonstrably changed on both global and regional scales since the pre-industrial era, with some of these changes attributable to human activities.
or
Changes in sea level, snow cover, ice extent, and precipitation are consistant with a warm climate near the Earth's surface.
or below is the title of a particularily frightening looking graph on page 17. It shows sea level rise & CO2 levels goes on increasing & world temperature continues to rise LONG after CO2 emissions are brought under control. So even if we magically get "Back to the Future's" 'Mr Fusion' tomorrow, things will get worse for a long time to come.
CO2 concentration, temperature, and sea level continue to rise long after emitions are reduced.
Here is something I'm worried about but which does not get the press that 5 meter rises in sea levels does...
Climate change affects environmental issues such as loss of biodiversity, desertification, stratospheric ozone depletion, freshwater avaliability and air quality and in turn climate change is affected by many of these issues.
I could quote more (or much longer examples than these headings) but I think this fairly describes the main thrust of the document.
Terraforming Mars is climate change, global warming and adding greenhouse gases in a big way so people might logically expect those of us posting on this forum to know something on the subject. the IPCC has published two books of particular interstest to us:
"Climate Change 2001: Synthesis Report" and
"Climate Change 2001: The Scientific Basis"
You can track down copies from here:
http://www.ipcc.ch/pub/reports.htm
Or you can get printed documentation from IPCC Secretariat - World Meteorological Organizations Building
PO Box 2300 CH-1211 Geneva 2
Switzerland
Phone 41 22 730 8284 / 8208
Warm regards, Rick.
Ok it's my turn to make up imaginary poll results.
If you ask 100 random people on the street who would you rather trust: a bunch of politicians or the media ... well, obviously people will say they trust the media. This proves how wrong the results of a made up poll can be.
Hi clclops,
Touche'. However, the point of the sarcasm in my statement was to emphise the quality of the SOURCE OF data which people are using in this 'debate'. I was also trying to inject a little humor into an otherwise pedantic rant.
Any comments on the results reported by the AAAS or the EPA?
Warm regards, Rick.
Hi Everyone,
Sticking with our American government agencies theme the National Research Council has written a 244 page book called:
"Abrupt Climate Change: Inevitable Surprises"
which I think is actually a pretty cool title. It costs only $44.96 as of this writing and can be ordered from this link:
http://books.nap.edu/catalog.php?record_id=10136#toc
However, there is a 4 page summary of the book that can be read for free from this URL:
http://www.nap.edu/html/climatechange-b … -brief.pdf
Or for those executives out there, they have a 24 page executive summary (also for free) here:
http://books.nap.edu/execsumm_pdf/10136.pdf
Some people don't believe things happen in the future unless they are in science fiction first. Fear not, for I refer you to:
"Heavy Weather" by Bruce Stirling. This novel set in the next century. They have a new phrase 'heavy weather' to describe the larger storms caused by global warming. (Weather is a heat engine and with more heat you get more power in the engine.) The story follows a group of tornado chasers thru the desert that the American Midwest has become. (This desert is caused only partly by global warming but also because of unregulated pumping of the aquifer that is going on now. Remember: The Biggest Pump Wins.)
http://search.barnesandnoble.com/bookse … 2926&itm=5
"Mother of Storms" by John Barnes. In this novel a minor disaster lets loose a whole lot of methane from the thawing artic. Methane breaks up in ~9 years in our atmosphere so there is a year or three significant increase in temperature. This adds on to the already warmer world of the furture.
Now hurricanes grow when the sea water is 29.5 degrees C or warmer and shrink when the water is colder (or if they are over land). Currently the hurricane breeding zones are small triangular patches of oceans inside the 29.5 C isotherms. But now these patches of oceans get a lot bigger...
This is a highly recommended book for those interested in heavy weather and big storms.
http://search.barnesandnoble.com/used/p … 533453&z=y
Warm regards, Rick
Hi everyone,
If you ask 100 random people on the street who would you rather trust, a bunch of scientists or the politicians. Well, obviously people will say they trust the politicians. (Scientists can't lock you up forever with no civil rights after all...)
So let us go to the government website for information on climate change. I quote:
Climate Change - Science: State of Knowledge
As with any field of scientific study, there are uncertainties associated with the science of climate change. This does not imply that scientists do not have confidence in many aspects of climate science. Some aspects of the science are known with virtual certainty(1), because they are based on well-known physical laws and documented trends. Current understanding of many other aspects of climate change ranges from “likely” to “uncertain.”
What's Known
---------------------
Scientists know with virtual certainty that:* Human activities are changing the composition of Earth's atmosphere. Increasing levels of greenhouse gases like carbon dioxide (CO2) in the atmosphere since pre-industrial times are well-documented and understood.
* The atmospheric buildup of CO2 and other greenhouse gases is largely the result of human activities such as the burning of fossil fuels.
* A warming trend of about 0.7 to 1.5°F occurred during the 20th century. Warming occurred in both the Northern and Southern Hemispheres, and over the oceans (NRC, 2001).
* The major greenhouse gases emitted by human activities remain in the atmosphere for periods ranging from decades to centuries. It is therefore virtually certain that atmospheric concentrations of greenhouse gases will continue to rise over the next few decades.
* Increasing greenhouse gas concentrations tend to warm the planet.
What's Likely?
---------------------
The Intergovernmental Panel on Climate Change (IPCC) has stated "There is new and stronger evidence that most of the warming observed over the last 50 years is attributable to human activities" (IPCC, 2001). In short, a number of scientific analyses indicate, but cannot prove, that rising levels of greenhouse gases in the atmosphere are contributing to climate change (as theory predicts). In the coming decades, scientists anticipate that as atmospheric concentrations of greenhouse gases continue to rise, average global temperatures and sea levels will continue to rise as a result and precipitation patterns will change.What's Not Certain?
-----------------------------
Important scientific questions remain about how much warming will occur, how fast it will occur, and how the warming will affect the rest of the climate system including precipitation patterns and storms. Answering these questions will require advances in scientific knowledge in a number of areas:* Improving understanding of natural climatic variations, changes in the sun's energy, land-use changes, the warming or cooling effects of pollutant aerosols, and the impacts of changing humidity and cloud cover.
* Determining the relative contribution to climate change of human activities and natural causes.
* Projecting future greenhouse emissions and how the climate system will respond within a narrow range.
* Improving understanding of the potential for rapid or abrupt climate change.
Addressing these and other areas of scientific uncertainty is a major priority of the U.S. Climate Change Science Program (CCSP). The CCSP is developing twenty-one Synthesis and Assessment products to advance scientific understanding of these uncertainty areas by the end of 2008. More information.
References
* IPCC, 2001: Climate Change 2001: The Scientific Basis.Exit EPA Disclaimer Contribution of Working Group I to the Third Assessment Report of the Intergovernmental Panel on Climate Change [Houghton, J.T., Y. Ding, D.J. Griggs, M. Noguer, P.J. van der Linden, X. Dai, K. Maskell, and C.A. Johnson (eds.)]. Cambridge University Press, Cambridge, United Kingdom and New York, NY, USA, 881pp.* National Research Council (NRC), 2001. Climate Change Science: An Analysis of Some Key Questions.Exit EPA Disclaimer National Academy Press, Washington, DC
(1) Throughout the science section of this Web site, use of "virtual certainty" (or virtually certain) conveys a greater than 99% chance that a result is true. Other terms used to communicate confidence include "very likely" (90-99% chance the result is true) and "likely" (66-90% chance the result is true). These judgmental estimates originate from the Intergovernmental Panel on Climate Change (IPCC, 2001).
Hrmmmph... Well what does the Environment Protection Agency know anyway? Someone should slash their budget or something.
If anyone wants to see the origional site and check out their links it can be found here:
http://www.epa.gov/climatechange/scienc … ledge.html
Warm regards, Rick.
Hi all,
The American Association for the Advancement of Science is perhaps the premier body for American Scientists. What do they say on Climate Change? I quote:
The Scientific Consensus on Climate Change
Naomi Oreskes*Policy-makers and the media, particularly in the United States, frequently assert that climate science is highly uncertain. Some have used this as an argument against adopting strong measures to reduce greenhouse gas emissions. For example, while discussing a major U.S. Environmental Protection Agency report on the risks of climate change, then-EPA administrator Christine Whitman argued, "As [the report] went through review, there was less consensus on the science and conclusions on climate change" (1). Some corporations whose revenues might be adversely affected by controls on carbon dioxide emissions have also alleged major uncertainties in the science (2). Such statements suggest that there might be substantive disagreement in the scientific community about the reality of anthropogenic climate change. This is not the case.
The scientific consensus is clearly expressed in the reports of the Intergovernmental Panel on Climate Change (IPCC). Created in 1988 by the World Meteorological Organization and the United Nations Environmental Programme, IPCC's purpose is to evaluate the state of climate science as a basis for informed policy action, primarily on the basis of peer-reviewed and published scientific literature (3). In its most recent assessment, IPCC states unequivocally that the consensus of scientific opinion is that Earth's climate is being affected by human activities: "Human activities ... are modifying the concentration of atmospheric constituents ... that absorb or scatter radiant energy. ... [M]ost of the observed warming over the last 50 years is likely to have been due to the increase in greenhouse gas concentrations" [p. 21 in (4)].
IPCC is not alone in its conclusions. In recent years, all major scientific bodies in the United States whose members' expertise bears directly on the matter have issued similar statements. For example, the National Academy of Sciences report, Climate Change Science: An Analysis of Some Key Questions, begins: "Greenhouse gases are accumulating in Earth's atmosphere as a result of human activities, causing surface air temperatures and subsurface ocean temperatures to rise" [p. 1 in (5)]. The report explicitly asks whether the IPCC assessment is a fair summary of professional scientific thinking, and answers yes: "The IPCC's conclusion that most of the observed warming of the last 50 years is likely to have been due to the increase in greenhouse gas concentrations accurately reflects the current thinking of the scientific community on this issue" [p. 3 in (5)].
Others agree. The American Meteorological Society (6), the American Geophysical Union (7), and the American Association for the Advancement of Science (AAAS) all have issued statements in recent years concluding that the evidence for human modification of climate is compelling (8).
The drafting of such reports and statements involves many opportunities for comment, criticism, and revision, and it is not likely that they would diverge greatly from the opinions of the societies' members. Nevertheless, they might downplay legitimate dissenting opinions. That hypothesis was tested by analyzing 928 abstracts, published in refereed scientific journals between 1993 and 2003, and listed in the ISI database with the keywords "climate change" (9).
The 928 papers were divided into six categories: explicit endorsement of the consensus position, evaluation of impacts, mitigation proposals, methods, paleoclimate analysis, and rejection of the consensus position. Of all the papers, 75% fell into the first three categories, either explicitly or implicitly accepting the consensus view; 25% dealt with methods or paleoclimate, taking no position on current anthropogenic climate change. Remarkably, none of the papers disagreed with the consensus position.
Admittedly, authors evaluating impacts, developing methods, or studying paleoclimatic change might believe that current climate change is natural. However, none of these papers argued that point.
This analysis shows that scientists publishing in the peer-reviewed literature agree with IPCC, the National Academy of Sciences, and the public statements of their professional societies. Politicians, economists, journalists, and others may have the impression of confusion, disagreement, or discord among climate scientists, but that impression is incorrect.
The scientific consensus might, of course, be wrong. If the history of science teaches anything, it is humility, and no one can be faulted for failing to act on what is not known. But our grandchildren will surely blame us if they find that we understood the reality of anthropogenic climate change and failed to do anything about it.
Many details about climate interactions are not well understood, and there are ample grounds for continued research to provide a better basis for understanding climate dynamics. The question of what to do about climate change is also still open. But there is a scientific consensus on the reality of anthropogenic climate change. Climate scientists have repeatedly tried to make this clear. It is time for the rest of us to listen.
References and Notes
1. A. C. Revkin, K. Q. Seelye, New York Times, 19 June 2003, A1.
2. S. van den Hove, M. Le Menestrel, H.-C. de Bettignies, Climate Policy 2 (1), 3 (2003).
3. See www.ipcc.ch/about/about.htm.
4. J. J. McCarthy et al., Eds., Climate Change 2001: Impacts, Adaptation, and Vulnerability (Cambridge Univ. Press, Cambridge, 2001).
5. National Academy of Sciences Committee on the Science of Climate Change, Climate Change Science: An Analysis of Some Key Questions (National Academy Press, Washington, DC, 2001).
6. American Meteorological Society, Bull. Am. Meteorol. Soc. 84, 508 (2003).
7. American Geophysical Union, Eos 84 (51), 574 (2003).
8. See www.ourplanet.com/aaas/pages/atmos02.html.
9. The first year for which the database consistently published abstracts was 1993. Some abstracts were deleted from our analysis because, although the authors had put "climate change" in their key words, the paper was not about climate change.
10. This essay is excerpted from the 2004 George Sarton Memorial Lecture, "Consensus in science: How do we know we're not wrong," presented at the AAAS meeting on 13 February 2004. I am grateful to AAAS and the History of Science Society for their support of this lectureship; to my research assistants S. Luis and G. Law; and to D. C. Agnew, K. Belitz, J. R. Fleming, M. T. Greene, H. Leifert, and R. C. J. Somerville for helpful discussions.10.1126/science.1103618
The author is in the Department of History and Science Studies Program, University of California at San Diego, La Jolla, CA 92093, USA. E-mail: noreskes@ucsd.edu
So the AAAS says that scientists a) working in the field and b) not working for oil companies, are pretty much unanimously agreeing, that the Earth is heating up and human actions are almost certainly driving climate changes. But they are just the American Association for the Advancement of Science. We will dig deeper.
The origional document is here in case you wish to check out their links and other science news. (China today has started spending a huge amount on science infrastructure with little fanfare. Good for them!)
http://www.sciencemag.org/cgi/content/f … /5702/1686
Warm regards, Rick.
Hi Everyone,
Mars2015, what an interesting thread. I have some comments...
Here's some different ideas of what we can use on Mars to power cars ....
Solar-...
It was pointed out to me that Mars' near vacuum atmosphere makes up for its greater distance from the sun so that solar power is about as efficient as it is here (which is to say, pretty inefficient). My understanding is that this thread is for how to power vehicles so solar is pretty much out, it does not have the energy density. (You could gradually build up a mass of energy using solar cells but for a vehicle you will need a richer energy storage medium.) We actually don't have any sort of energy shortage on the Earth now. The Earth is seething with radioactivity and energy of all types. We are lacking a good way of storing and concentrating power. (See "Friday" by R. A. Heinlein for a fictional account of what would happen with cheap energy storage.)
Hydrogen-...
We can crack O2 and 2 x H2 from a couple of water molicules but this requires a lot of power. I think that there is lots of water on Mars in the form of permafrost and ice so I don't think you will have much trouble finding water. (At least more than 40 degrees away from the equator.) There are problems with burning H2 & Oxygen: first, you need to carry both fuel and oxidizer. Second, they burn hot. Most internal combustion engines will erode quickly at their combustion temperatures. This could be fixed by using CO2 as a buffer gas. Overall, it is not bad. You need a local source of water but with enough power you can make everything locally.
Wind/Hydroelectric -
Again these are too diffuse for a vehicle but could gradually accumulate power if you have good storage for concentrated energy. Windmills on Mars need to be big, which makes them expensive. There is also a concern about how well they will run (with all those moving parts) in an environment with the very fine, possibly toxic dust.
There is a study in "On To Mars: Colonizing a New World" by the Mars Society, called "Mars Surface Power Technologies Options" by Jeff A. Wead on pg 146. He found that the best power option for a Mars base was geothermal (if it could be found) followed by nuclear fission, followed by solar. It was followed more distantly by solar power satellites (SPS) beaming microwaves & wind.
Ethanol/Methanol - ...
You would still need to carry oxidizer and fuel for your vehicle. Closely related to this is Methane (CH4) which can be gotten from water and Carbon dioxide so you don't need a lot of crops (just concentrated energy).
In the "Case for Mars" by Robert Zubrin, on page 143 he suggests a number of different options. A highly regarded one is the Methane Oxygen car discussed above.
ibid: pg 182. Zubrin points out that with some power and chemistry we can turn water and CO2 into Ethylene. This is a great fuel and Mars storable. (It is also the basis for a plastics industry.)
ibid: pg 202. Zubrin shows that you can make Silane (SiH4) on Mars. The interesting thing about Silane is that it burns using Carbon Dioxide as the oxidizer. So using this fuel, you do not have to cart around your oxidizer as well as your fuel. The big problem with burning silane is that it produces silicon as a waste product which would jam an internal combustion motor. So we would have to make it an external combustion plant (a steam roadster) to use this fuel source.
ibid: pg 213 Zubrin suggests using a nuclear reactor to provide thrust with CO2 as a reaction mass. (He calls this "NIMF" for Nuclear rocket using Indigenous Martian Fuel.) This gives you a truck that can move anywhere on the planet landing and refueling (compressing CO2) if you need to extend your range.
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Everything depends on abundant power.
I absolutely agree with you MarsDog. With abundant power you can melt ice, create fuel and air from CO2, create plastics, metals, bricks, ceramics, etc. You will have the power to send data at high data rates improving the science. Your explorers will be able to move around faster and farther, doing more science and learning more.
Use solar or/and nuclear energy to produce nanoparticle alluminium dust.
I don't know how easy it will be to generate nano scale aluminum dust but you wouldn't want to burn it in an internal combustion engine as it will produce AlO which is a solid. It could be used in a external combustion engine. By the way, why not use Iron nano-particles? It will also burn in oxygen and we will be getting tonnes of the stuff as we process the dirt.
My personal vision of Mars is initially one in which we start with the basics in order to keep the cost down. As all high technology will have to be imported from Earth at substantial cost for quite a long time; i suggest that we would have to engage in what I call "retro-tech".
Hi Thomas,
I think faster growth of the colony would be to have certain high tech items imported from Earth (rocket engines, computers, iron carbonyl manufacturers, fission reactors (until we find uranium and or geothermal power on Mars), etc. The Martians will build everything else themselves a soon as possible. Economic independence is vital as much as possible but growth will be fastest with a high energy / high industrial control strategy.
Dook,
Natural gas is a fossil fuel. So if other fossil fuels come from CH4, where does the CH4 come from? The planet wide dust storms will continue until we raise the south pole's temperature by 4 to 5 degrees C. Then the subliming CO2 cap won't drive the dust storms. As for solar being a good source of power... well... OK. I think it is marginal and will get worse as we get more air and clouds on Mars.
The efficiency of solar probably deserves its own post. Another time.
Stormrage, I'm afraid that there is no chance of finding a large (as in micrograms or larger) chunk of antimatter anywhere in the solar system. Every partical in the solar system is hit with particles from the solar wind. If there was any antimatter it would soon erode away displaying a bright gamma ray gravestone. Reddragon had the right of it.
There is however huge amounts of Helium 3 in the outer solar system. This is the most concentrated form of energy we are likely to find in the universe.
Warm regards, Rick.
I think compared to the amount of time it takes for the Global climate to change, practical controlled fusion should occur "soon". If we achieve controlled fusion in the next 100 years, that should be soon enough to halt and reverse global warming, if humanity's output of carbon dioxide is what's causing it.
Hi Tom,
I am busy researching a long post which speaks to some of the points you make so I won't go into them here. I would be less concerned about global warming if political leaders were pushing the development of non-fossil fuel technologies, but they are not. Also, do you have any numbers on how long it takes for Earth to remove (say) 100 ppm of CO2 out of the air? These would be very important numbers. I have them if you don't. (Wait for my next post for more details.)
I think though that many Canadians might come to regret it if ever we succeeded in reversing global warming. The Little Ice Age that started in the Middle ages, might have been the beginnings of a real ice age, that out CO2 emmisions put a stop too. Canada might not be a pleasant place to live if the glaciers started advancing again. If not for the little ice age, we might all be speaking Norse at this time. The Viking colony in Greenland failed because of this little Ice Age.
The Little Ice Age is certainly not news to me.
In a government poll last year the top concern of a huge number of Canadians was climate change. This so shocked the government it went from totally saying that climate change was nonsense to saying climate change is their 'top priority' (but still doing very little about it). So lots of Canadians will be smacking their heads if all the melting glaciers reverse themselves and giant ice sheets start forming over our melting permafrost.
In any case we are still in an ice age (there is perminant ice at both poles). The point is that our world is used to the status quo. The people are where there is rainfall and soil and any change is going to cause huge disrubtions and misery; it will cause wars and famines. Those are awfully high stakes to dismiss with an "Oh, magical fusion will solve things."
If you think that the chances of fusion appearing are inevitable, then think about how well fission power has done. Or an even better example: think of how the clean and awesomely efficient magnetohydrodynamics (now magnetoplasmadynamics) power plants have done in the world energy market.
Anyway this is just a quick post to say that I am working on a long reply to your earlier post but it likely will be a few days tracking down the references to support my arguments.
Warm regards, Rick.
Hi Dicktice,
There are problems with Geothermal power as well. A geothermal reactor on the border of France - Switzerland injected high pressure water into the rocks which caused earth quakes damaging a small town across the border in Switzerland. The company owning the reactor is being sued for damages and endangerment because it turns out that scientists advised the plant owners that the geothermal reactor might cause earthquakes. (They ignored this warning hoping that any earthquakes would be too small, so they are likely liable.)
Anyway the whole project is likely going to be canned permanently. Yes it is clean power, but sadly, it knocks down buildings & might kill people.
I saved the newspaper clipping, but I can't find it right now. I'll edit this post & give more details when it turns up.
The excitement over fusion is simply it is orders of magnitude more concentrated energy than anything except fission, it produces few radioactive wastes and it burns deuterium found in water.
In "New Destinies Volume IX" pg 273 S. M. Stirling writes an essay called "Fusion" which draws the conclusion (based on historical analogies) that the wealth and freedoms a population enjoys is based on how concentrated their power sources are.
That is what excites people about fusion. With enough power we can crack water for a hydrogen economy, blast chemical toxic wastes into elemental forms and vastly improve our standard of living in a myriad of ways. Fusion (if it works) is a quantum step forward in humanities net wealth.
EDIT: After learning more I take back what I say about the hydrogen economy. It is a myth. You may wish to read, "Energy Victory" by Robert Zubrin.
As for me, I think that we could have fusion. With the steadily declining funding for it, we are not likely to find out soon, tho.
EDIT: More information on Fusion. Progress in Fusion research is measured by the the Lawson Parameter. In 1960 the Lawson Parameter was ~1E16 m^3s keV (cubic meter seconds kilo electron volts). Currently we are about 1.5E21 m^3s keV and have sat there for the last 7 years because the current generation of new reactors have had their funding cut. A deuterium - tritium plasma with a Lawson parameter of 4E21m^3s keV will reach ignition and we will have fusion power.
Let me be clear here. Since 1960 we have increased the value of the Lawson parameter 10,000 times. A final tripling of it is all we need for fusion power. This will certainly be reached if the next generation of fusion reactors are build but their funding was cut some 6 years ago. Fusion will generate a gigantic amount of wealth and provide freedom from OPEC. Strangely, on the very edge of success, the budget for fusion has been cut to less than $250M in the USA.
See "Entering Space: Creating a Spacefaring Civilization" by Dr. Robert Zubrin page 84 to 90, and "Fusion: An Energy Option for the Future" by EFDA (the European Fusion Community) and is available for free from their website.
Warm regards, Rick.
Hi Clclops,
Nice to hear from you.
Alternately you could think of it as: "Why not experiment on Mars first where it can't do any harm, rather than trying to regulate climate on Earth first." (And we likely will need to within 200 to 350 years the way we are going.)
Warm regards, Rick.
Hi everyone.
Even partial terraforming will be very helpful to colonists. Raise the temperature of Mars' south pole by 4 or 5 degrees and the CO2 will sublime. This will at least push the pressure up to 14 mBars from the current 6 mPa. This will help as it will reduce the dust storms and double the atmospheres protection from cosmic rays.
It will also warm the planet more.
There is CO2 locked in clays. As the temperature rises this will slowly be released. Likewise, there is CO2 in clathrates. If the temprature increases several more degrees then we get up to ~50 mBars pressure. Now people need masks but don't need pressure suits.
Warm up the planet some more, and we don't need such excessive efforts to stay warm. Moving off the equator becomes more reasonable.
Introduce cyanobacteria (blue green algae) and you start pumping O2 in to the air. The ozone layer starts to build up. This is a big help to colonists.
As O2 and N2 levels rise, it becomes cheaper and cheaper to concentrate usable levels out of the atmosphere using simple technology such as low tech compressors. This makes it easier for colonists to live independent of large, centralized life support.
We don't need human levels of oxygen for insects. Once they are able to survive we can greatly diversify the ecosystem.
If we wait for Mars to bury its excess carbon in peat bogs and the like it will take 100,000 years to get a human breathable atmosphere. If we force it by burying tonnes of carbon (or shipping it outside the biosphere like to the top of Olympus Mons) then it could be managed in perhaps 10,000 years.
My point is that there are lots of reasons for people on Mars to feel it is worthwhile to make the planet 'just a little bit better'.
Chat, do you have references for your theory about hitting the south polar cap with a large comet? I would be interested in the details. My understanding is that even a big, multi-gigatonne impact is dwarfed by a year's worth of reflected sunlight.
Dook, the heat of a few dozen reactors is insignificant compared to the energy given by a 125 km^2 mirror reflecting the sun. The human colonists will joyfully use the 'waste heat' for warmth and to speed energy intesive chemical reactions but I doubt it will have any climatic effect.
Warm regards, Rick.
Hi John,
I would welcome references to how many tonnes of carbon dioxide, sufides, nitrates, heavy metals, fly ash, bottom ash, radioactivity and slag a "clean coal" plant produces each year.
If you give references to what you say, people will take you more seriously. "Clean coal" to me is an oxymoron. It sounds like a slogan invented by the publicity department of some coal burning power company.
Also your argument is logically flawed. If China and India are going to start burning coal that does not mean that we should. "If all your friends / aquaintences / enemies jumped off a cliff, should you?" They are trying to rapidly industrialize and are using very fast & dirty ways to do it. We live in a wealthy society and have more choices.
What is more, ethically we are not in a very good position to call foul on them. We used plenty of coal and other dirty power to get our industrial revolution off the ground. Power density equals wealth. Do we say to them, "you can't industrialize, so sorry, you have to stay poor?"
Warm regards, Rick
Hi Karov, everyone.
I browsed thru some of your links. Very nice. But nuclear synthesis makes the atoms a handful at a time and requires tonnes of energy.
When a volcanic melt starts rising towards the surface and then cools the flourine and chlorine compounds freeze out first at the top. Heavier, denser materials collect at the bottom. Finally the minerals with the highest melting points form large crystals in the middle.
If this pluton is exposed, the fluorine and chlorine minerals are brittle so they erode quickly and are scattered. But if you mine a pluton that was never eroded the flourine is reasonably concentrated.
It seems to me that this would be cheaper than trying to create new fluorine wholesale. Would you like to address the relative costs of mining fluorine as opposed to nuclear synthesis?
Warm regards, Rick
Hi everyone,
Fluorine atoms are extreamly powerful oxidizers. In fact they are better oxiders than oxygen is. (If you start out with an atmosphere of fluorine and silicon - oxygen rocks you would end up with an oxygen atmosphere and silicon - fluorine rocks.)
The point of the chlorofluorocarbons and the perfluorocarbons is that the fluorine binds so tightly to the other atoms that very few chemical reactions at standard temperatures and pressures are capable of breaking them away. This makes the compounds extremely non-reactive.
You could break up these molecules with a lot of heat energy. Or if you have exactly the right frequency of high energy ultraviolet light that can do it.
These compounds are very safe for humans. In fact, they inflate eye balls with them for some operations and let the blood stream pull the gas out as the eye refills with jelly. The gas is exhaled from the lungs into the atmosphere. See this post by RobertDyck:
In any case, the point is perfluorocarbons are amoung the least toxic of any substances on the planet. Having them in parts per million concentration would have no effect on people, except to make the planet warmer of course.
Warm regards, Rick
Coal is easily the dirtiest form of energy production on the planet. A single 1,000 Megawatt coal plant releases approximately 600 pounds of carbon dioxide and 30 pounds of sulfur dioxide into the atmosphere each SECOND.
In one second it releases as much nitrogen oxides as 200,000 automobiles. These polutants are estimated to cause 25 premature fatalities and 60,000 cases of respiratory complaints per year / power plant.
Additionally, this plant has to get rid of 30,000 truckloads of ash annually. (This amount would cover a square mile 60 feet deep.) The ash is full of carcinogens, highly acidic (or sometimes highly alkaline depending on the type of coal).
Run off from these dumps have sterilized streams and devistated communities.
Coal is a very dirty form of energy. All sorts of stuff is mixed up with it. I quote:
In short, naturally occurring radioactive species released by coal combustion are accumulating in the environment along with minerals such as mercury, arsenic, silicon, calcium, chlorine, and lead, sodium, as well as metals such as aluminum, iron, lead, magnesium, titanium, boron, chromium, and others that are continually dispersed in millions of tons of coal combustion by-products. The potential benefits and threats of these released materials will someday be of such significance that they should not now be ignored.--Alex Gabbard of the Metals and Ceramics Division
Furthermore the acid rain from the sulfur and nitric oxides damages the health of forests, sterilizes lakes and leaches heavy metals into the environment. (When Canada complained about the acid rain that was sterilzing lakes in Ontario, the USA basically told us to take a hike. In many ways the USA is not a very likable, social or fair neighbour.)
Finally, coal contains trace amounts of Uranium, Thorium and other radioactive elements. (Usually at least 2 to 3 parts per million, tho it ranges from 1 to 10 ppm.) A 1,000 MWatt coal plant produces 100 times MORE radioactivity than a equally powerful nuclear plant and it scatters the nuclear waste widely into the biosphere. If people were rationally concerned with radioactive wastes they would start by closing down coal plants.
(In fact, the uranium released by a coal burning plant has more energy in it than the energy got by burning the coal!)
For more information see:
// A site that discusses the radiation releases from coal plants
http://www.ornl.gov/info/ornlreview/rev … lmain.html
// A discussion (With lots of references!) talking about nuclear power. It points out that there is a double standard between coal radioactivity and nuclear radioactivity.
http://en.wikipedia.org/wiki/Nuclear_power
An essay in: "Catastrophes, Chaos & Convolutions" by James P. Hogan page 182. Much of the data on conventional wastes by coal burning plants.
// Website about acid rain.
http://www.ec.gc.ca/acidrain/
// More on acid rain
http://archives.cbc.ca/IDD-1-75-584/sci … acid_rain/
J. O. Corbett, "The Radiation Dose From Coal Burning: A Review of Pathways and Data," Radiation Protection Dosimetry, 4 (1): 5-19.
T. L. Thoem, et al., Coal Fired Power Plant Trace Element Study, Volume 1: A Three Station Comparison, Radian Corp. for USEPA, Sept. 1975.
W. Torrey, "Coal Ash Utilization: Fly Ash, Bottom Ash and Slag," Pollution Technology Review, 48 (1978) 136.
Hi all,
The above post is off topic so I have created a new thread called "Is Global Warming Real" to discuss this.
Warm regards, Rick