The idea is that if you fantasize that this might, one day, have gain > 1 it would be much smaller and lighter than other forms of fusion that you might also fa

The idea is that if you fantasize that this might, one day, have gain > 1 it would be much smaller and lighter than other forms of fusion that you might also fantasize would, one day, have gains > 1. But, in this fantasy world, terrestrial fusion reactors would have much higher fantasy gains, so you are accepting a lower fantasy gain for lower weight. The reality is, fusion energy research has been a major activity since the 1950s, but no device (aside from bombs) has achieved practical break-even, despite occasional breathless but deceptive press releases from national labs. http://progressive.org/op-eds/let-cut-our-losses-on-fusion-energy-180313/ http://progressive.org/op-eds/let-cut-our-losses-on-fusion-e...