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Eniac comments on Stupid Questions December 2014 - Less Wrong Discussion
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Would it be possible to slow down or stop the rise of sea level (due to global warming) by pumping water out of the oceans and onto the continents?
Well, this is not pumping, but it might be much more efficient: As I understand, the polar ice caps are in an equilibrium between snowfall and runoff. If you could somehow wall in a large portion of polar ice, such that it cannot flow away, it might rise to a much higher level and sequester enough water to make a difference in sea levels. A super-large version of a hydroelectric dam, in effect, for ice.
It might also help to have a very high wall around the patch to keep air from circulating, keeping the cold polar air where it is and reduce evaporation/sublimation.