Fusion is irrelevant as a practical energy source here on earth. The simple reason is that we already have all the "fusion energy" we'll ever need from that big fusion reactor in the sky... modern photovoltaics convert this energy to electricity at close to the same efficiency that you could convert the heat from a controlled fusion reactor to electricity. OK, yeah, photovoltaics still don't work at night, but there's a battery revolution underway that is solving that problem, and the two, photovoltaics + batteries, are already vastly cheaper than fusion can ever hope to be.
Fusion will be important for the future of humanity, especially in deep space, so we should keep researching and developing it. But it's not relevant to the climate crisis... the already existing technologies have that covered, we only need to deploy them faster.
Fusion will be important for the future of humanity, especially in deep space, so we should keep researching and developing it. But it's not relevant to the climate crisis... the already existing technologies have that covered, we only need to deploy them faster.