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This would be best produced in cold countries, where the heat removed from the air could be used to warm houses, then the liquid air could be exported and used in hot countries that already have the heat needed to release the air, in the air. Also, it could be used to cool down hospitals etc. in Africa and similar places. "Liquid-air" pipes could run from the polar regions to the equator, and some sort of heatpipes could return heat in the form of hot water.