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Not all heat is useful. If there was a magic device that could take any heat and convert it into electricity, global warming could be trivially reversed.

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There is the Seebeck effect, where you run a Peltier junction in reverse. Efficiency is, to put it mildly, low. [1]

[1] https://en.wikipedia.org/wiki/Thermoelectric_generator

This still works from a temperature differential, not just a quantity of heat.

furthermore you could prevent the heat death of the universe :)

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