re: #21 Gus 802

Nuclear generated electricity. Battery technology. And non-watch-like Russian rockets to propel the nuclear waste into deep space.

I don’t think that will ever become cost effective unless we either discover anti-gravity, or have a space elevator setup. Dumping nuke waste on the moon or in a non-earth intersecting orbit is not that hard, getting from the ground to earth orbit in the first place. Very hard.