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There is no possible way for humans to ever extract enough geothermal energy in any of our lifetimes, expanded out to 100,000 lifetimes, to ever affect the geothermal reserves of the earth. You are making things up to fit you argument that solar is better.

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There was this idea going around that solar power would cause global warming, since a solar panel is typically warmer than whatever was there before it was installed. But the idea turns out to be bullshit, the warming effect is tiny compared to what the equivalent co2 from fossil fuels would cause.

The lesson is: Always. Do. The. Math. First.

You can't really do the math until you have an idea of what you want to calculate.

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