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Could geothermal energy be considered nuclear energy?

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Technically, yes you're (partly) right. The heat within the earth is generated by radiation but also tidal forces and pressure. Geothermal heat is not nuclear fission or fusion though. It's just (partly) radioactive decay. read more

Really, the only energy available on Earth that cannot be considered in some sense as ultimately deriving from nuclear reactions, is that half of the geothermal energy which comes from the heat of formation of the Earth, the tidal power, and any potential energy that may still reside in the form of unreacted chemical elements or compounds, still left over from the beginning of the Earth, which could conceivably react exergonically, or change phase and form a lower energy state. read more

In a closed nuclear fuel cycle utilizing breeder reactors, nuclear fuel could therefore be considered renewable. In 1983, physicist Bernard Cohen claimed that fast breeder reactors, fueled exclusively by natural uranium extracted from seawater, could supply energy at least as long as the sun's expected remaining lifespan of five billion years. read more

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