Not geothermal I would think?
replyActually thinking back I think he might have said "nuclear fission and geothermal". This was months ago.
replyArguably nuclear fission in this case.
replyGeothermal is not nuclear fission. It's some combination of primordial heat from the formation of the Earth (which was gravitational energy) and radioactive decay (which is distinct from fission).
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