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One idea (lasted longer than 3 centuries) for how to cool hot air

:nlbi: did not require energy be taken by blowing up mountains to get coal, nor any fossil fuel to power combustion engine.

Terra-cotta evaporative cooler [good, informative article - 1]
set a seeping water source and use gravity over a large vertical area to cool terra-cotta or clay tubes.

[1]archpaper.com/2019/02/ant-stud

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