Nuclear Fission might be too slow to build - at least that's what the report claims. That would not be a problem with Fusion - its energy output should be so high that building it should still be worth it. The 'slow' regarding Fusion is the time taking to research it.
IMHO, researching Fusion is worth it, but we can't rely on it at all for solving our problems, since it's unlikely to be available in time. We'll have to handle our climate problem with more ordinary means.
Nuclear Fission might be too slow to build - at least that's what the report claims. That would not be a problem with Fusion - its energy output should be so high that building it should still be worth it. The 'slow' regarding Fusion is the time taking to research it.
IMHO, researching Fusion is worth it, but we can't rely on it at all for solving our problems, since it's unlikely to be available in time. We'll have to handle our climate problem with more ordinary means.