I'll do you one step better: you could use that energy source to produce closed-loop hydrocarbon fuels (e.g. methane via the Sabatier process). It seems to me

I'll do you one step better: you could use that energy source to produce closed-loop hydrocarbon fuels (e.g. methane via the Sabatier process). It seems to me that virtually all of these problems reduce to the problem of finding a plentiful, climate-neutral energy source. (If only we had already invented such a thing in the 1940's....)