TheMajor comments on The Great Filter is early, or AI is hard - Less Wrong
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I also see this claimed often but my best guess also is that this might likely be the hard part. Getting into space is already hard. Fusion could be technologically impossible (or not energy positive).
It seems like there is steady progress at the fusion frontiers
Though in the case of ITER the "steady progress" is finishing pouring concrete for the foundations, not tweaking tokamak parameters for higher gain!