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RobertDyck in the thread for terraforming the jovian moons and other gas giant icy satelites, pointed out very correct that there is a way to keep the depths of the terrafomed icy body under the water freeze point the same way the Earth surface -- the opposite way is isolated from it`s hot mantle.
Using fibre or foamed matterials between the terraformed warmed up layer and the firm ice basis we could use the entire surface, to modify easier the crust and relief...
But, back on earth: The ice is quite good biulding material. There were plans immediatelly after the WWII huge ice aircraft cariers to be constructed, around big nucleary powered fridges. There are projects in the earth pollar regions islands of permafrost to be made, isolated from the summer heat by sacks of sand and layers of soil... There are occasional brake ups from the antarctic ice sheet many kilometers wide -- bigger than the territory of the smallest nations. Already, ,there are attempts and projects huge icebergs to be packaged in order millions of tones fresh water to be shipped to the thirsty tropics. Combined:
Take or make iceberg (say from reinforced with organic fibres "icecrete"), say several dozens of km. wide (hundreds of sq.km.); shift it in the middle of the ocean towards tropics; make it with very fractal and slopy coastline. Cover it`s all surfaces with foamy material, cover it with soil, raise plants, biult houses... Remove the little amount of heat which penetrated the isolation with solar powered refrigerators...
Is it possible.
I it is, there`s no reason why not to repeat such tech on global scale over the icy worlds or for trapping the CO2 under water ocean during some phases of the Venusian terraforming.
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