First, I am not against nuclear and hope the fallout from this incident isn't used as fuel for damaging propaganda. But this >Solar? Workable on small scale, p

First, I am not against nuclear and hope the fallout from this incident isn't used as fuel for damaging propaganda. But this >Solar? Workable on small scale, physically impossible to provide the majority of humanity's energy needs. is wrong. Efficient use of all sustainable earth's solar input is a hard engineering problem (how best to stick satellites in space and then efficiently radiate back to base stations) but not impossible and would compete with anything Fusion (yes fusion) could produce. The world's current usage is estimated at 1.6 x 10^13/yr watts while 5.2 x 10^16 watts (30% of the sun's constant input to us) is completely reflected and never used by Earth. And the end game in some far flung future would be solar taken straight from the sun. The Kardashev scale is a probably not useful but nonetheless interesting take on this.