Economics. Fision which is a 'solved problem' is already too costly. Sure there will be fusion in a decade or two, but it will never be cost effective for electricity production.
It would be better for the environment if we had more nuclear, but in Europe newly build nuclear is insanely expensive. Like 3-4 times more expensive compared sun and onshore wind.
Maybe things will change with SMR, I don’t know, but not for now it seems
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Maybe things will change with SMR, I don’t know, but not for now it seems