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Rivers and seas impede human migration, and border walls seek to prevent it altogether.
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??? The seas are how humanity spread around globe in prehistory, and the rivers are all supplemented with canals. Walls do work though.
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Originally Posted by All Darc
If they could develop a way to harvest enery the the difference of potential (thermal) from cold air in relation to the warmer temperature of ground 3 meters away from surface.
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If you put an underground skirt of insulation around the base of the structure it encourages the thermoclines to sorta bubble up under the floor.