Agreed
Hi RL
We need both forms of fusion - indirect and direct - and I reckon we could do well with fission (not our current crappy enriched uranium nonsense, mind) too.
All three are the only long term energy sources and the only ones with off-world potential too. If self-replicating solar powersats ever become feasible (c. 2100) then they will allow a semi-Dyson shell to be built and practically unlimited power to be tapped. Only ultra-scale sollectors will be able to support astro-engineering on a planetary scale - that'll open any suitable object up for terraforming and/or orboforming.
But those are all wild, wild ideas for after our current time of troubles.
Adam
