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You didn't think about this enough. Energy escapes us, heats the air, air rises, condenses, it rains, plants use the nutrients, we eat the plants or animals, and the cycle restarts, or, the sun heats plants, blah blah blah. Only a small amount of heat is ever lost to space. The only thing we ever have to worry about is turning energy into an inorganic substance that won't break down such as styrofoam, because it takes water and heat to make that work, and it never breaks down, so essentially we have lost it for our use, but the energy is still there, just in a different form. Law of conservation of energy