Greyzone, before denigrating somebody else's 'pipedream', at least get your geographic facts correct. Solar energy is more abundant in the tropics or nearto than it is in either more northerly or more southerly locations.

Hemisphere-centricity aside, he's right. The "total solar flux" argument is the last refuge of the cornered cornucopian. It's a will o' the wisp that blows away at the first breath of common sense.

Right. Could one consider the fission products of all fissionable materials in the Earth's crust and bulk, or all the deuterium in the oceans?

Totally pointless---like pointing to the vast deserts of Australia or North Africa and exclaiming how much luxury truffles they could produce.

Whoa! Big deal! I spoke from a northern hemisphere perspective! Horror of horrors!

Guess what? Most of the land mass upon which solar collectors can be installed is... *drumroll* in the northern hemisphere.