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Picture this-in the Earth-year 6500:
Earth, having been through ups and downs, has stabilized it's population at 11.2 billion and thanks to the engineering advances gained from terraforming Mars and Venus, Earthlings have installed a very weak (2% insolation reduction) solar shade that keeps Earth at our favorite 15 degree C global temperature.
Mars-this was the first world to be terraformed. Today, Mars has a thriving ecosystem. Towards the end of terraforming, a solar lens was developed that keeps insolation at 88% of Earth level and varies through the year to soften the effect of the orbital eccentricity of the planet. Today Mars has an ozone layer and artificially maintained magnetic field powered by solar electromagnets. Despite the "artificiality" of the world it is 99% self-sufficient and only requires a small team of 100 scientists from all 11 martian nations to maintain and/or repair the lens and magnetic field.
Notable facts-the low gravity of Mars has made for some interesting wildlife! Most Martian birds have wings much smaller than their Earthly counterparts-watching them fly is quite a shock for an Earthling! Several species of trees that especially like Martian conditions grow to astounding proportions. The Martian Aspen, known for it's bright yellow autumn colors all over the plains and highlands of the Southern Hemisphere, grows to over 700 feet tall (certain specimens get to 1000 feet) with a root system that can span a kilometer across in even an average-sized tree. Humans have adapted well to the planet-Martian Basketball uses a hoop 21 feet off the ground. After the first couple generations, it was clear that Martians were a new "race" of humans so to speak. They are thinner and taller than their Earthly counterparts and tend to exercise more (both of necessity and ease since low gravity makes movement much easier) and human males average 6 feet 11 inches in height (females average 6'7). While Earthlings and Venusians can visit Mars rather easily with a week or two of low gravity training, native Martians can only visit Earth or Venus after a long period (a year or more) of 1G training, exercising, and drugs.
Atmospheric Density-1.1 atm (was made much thicker than originally planned due to N2 importation from Venus and the breakdown of NH3 used in terraforming)
Atmospheric composition - 18.7% Oxygen, 79.4% Nitrogen, 0.094% CO2, traces of Argon, CH4, NH3, and PFC's
Human Population-933 million
Water Coverage - 48.2%
Average Temperature - 12.5 degrees C
Venus was the next step. The project was started about halfway into Mars' terraforming as the Nitrogen was needed as well as some of the CO2. A 100% shade was placed in front of Venus that froze out the CO2 which was generally removed or broken into carbon for building and oxygen that was either used on Venus, shipped to Mars, or stored in orbital warehouses for space missions. In fact for over 3 centuries (in Earth years) Venus' number one and number two industries were oxygen and carbon production which was purchased by Venusians, Martians, and Earthlings alike.
During terraforming, the spin of Venus was increased to a tolerable 27 hours with the use of high-powered nuclear rockets in a "pinwheel" fashion around the planet. This did slow the cooling effort but was worth it-all models showed Venus not having settled weather or a useful ecosystem with such a long day.
Today, Venus is like a large tropical paradise with lots of shallow seas, small islands and a few small continents. Like Mars it has an artificial magnetic field and and a natural ozone layer. The climate is warm, and despite a solar shade keeping insolation at 95% of Earth levels, only the top of Mount Maxwell has ever seen snow. There are no seasons, just a slight variation in day length (only noticeable north of 65 degrees latitude) through the 225-day long year. Equatorial regions are very hot and humid (there are some deserts around 25 north and 60 North). A typical equatorial climate would be highs near 35 Celcius and lows around 30C. Rainfall is abundant. At mid-latitudes, temperatures are warm but more more reasonable-highs around 27C and lows around 20C. Polar regions are more erratic since day length does change noticeably with the 3 degree axial tilt, but frost is rare even here.
Atmospheric Density - 1.55 atm
Atmospheric composition - 17.1% Oxygen, 82.5% Nitrogen, 0.044% CO2, traces of Argon, H2SO4
Human Population - 2.2 billion
Water Coverage - 78.8%
Average Temperature - 22.9 degrees C
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More likely, 2120AD: Earth Destroyed by Failure of new Fusion reactor because the idiot who built it was taught Maths by a teacher who didn't know maths and was incapable of telling whether the book was wrong.
Mars Government traced the responsibility back to a government Committie on Mathematics (in 2003AD) who suddenly decided to do it a different way.
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More likely, 2120AD: Earth Destroyed by Failure of new Fusion reactor because the idiot who built it was taught Maths by a teacher who didn't know maths and was incapable of telling whether the book was wrong.
Mars Government traced the responsibility back to a government Committie on Mathematics (in 2003AD) who suddenly decided to do it a different way.
Could happen...
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While Earthlings and Venusians can visit Mars rather easily with a week or two of low gravity training, native Martians can only visit Earth or Venus after a long period (a year or more) of 1G training, exercising, and drugs.
Nice imagination overall, enjoyed that.
However you are making a technology mistake, why bother with the gravity training when they could just wear a powered exoskeleton that makes walking on Earth or Venus feel like Martian gravity ?
Hell, in the year 6500 such devices will probably be cheap and common place adjustable to suit varying gravity levels, weights, etc. Such technologies arn't even that far off in the year 2005.
Also, if Space elevators end up being viable for Earth and to some extent Venus and Mars, I think there would be a massive exodus off of Earth. Imagine everything from ghost countries to cities to towns, forest reclaiming their lost lands, wildlife stalking their way through the ruins of Earth dead cities.
Venus, given its more Earth-like gravity, warm weather would probably end up being the #1 destination in the end.
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