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The simple answer is entropy. It’s much easier to poor a bunch of energy into something and have it express itself as heat than it is to retrieve spent energy out of an object. You can burn down a forest and make a lot of light and heat, but you can’t spend light and heat to turn smoke into a dark, cold forest.
The simple answer is entropy. It’s much easier to poor a bunch of energy into something and have it express itself as heat than it is to retrieve spent energy out of an object. You can burn down a forest and make a lot of light and heat, but you can’t spend light and heat to turn smoke into a dark, cold forest.