Earth's original heat store still burning strong - Nature
Quote:
Radioactive decay is responsible for about half of the heat coming from the bowels of the Earth, suggesting that the remaining 50% is the primordial heat left over from when the Earth first formed.
Most of the heat given off by our planet – estimated to be about 174 petawatts (10^15 W) – first came from the Sun. But about 44 terawatts (10^12 W) of that is geothermal energy (pdf).
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Shows how much we can suck up, and how fast. Gotta get that GSHP before someone else steals my heat!
