I don't think fusion is coming soon enough to be part of the plans for Climate Change. People working on fusion reactors have been misleading the public about progress. They have been using a "Q" value (energy in versus energy out) to describe some internal process rather than the entire process. So when they say something like "67% efficiency" they really meant "1% efficiency."
Even building boring old nuclear fission plants is far too slow! We need big changes now, not in 5-10 years, and definitely not in (really optimistically for fusion) 25+ years.
1. https://whyy.org/segments/fusion-energy/