The reason for that is the green parties, certainly in Europe, got their start protesting nuclear weapons and nuclear energy both, and they were true believers

The reason for that is the green parties, certainly in Europe, got their start protesting nuclear weapons and nuclear energy both, and they were true believers in the cause. That was the 60s/70s. But in the mean time it's become clear that the biggest climate problem we have is not nukes, it's carbon -- and nuclear energy is really great in that respect: it doesn't produce any at all and it's reliable 24/7, and relatively cheap. It has a massive NIMBY problem, but ok. So while that's clear to anyone who thinks rationally, for green party types it requires changing their mind, their entire point of view, one they've held for maybe decades: nuclear energy is now good, we need more of that and less of the other. Some simply will not be convinced no matter that the facts have changed. Some turn to the whole "everybody must now ride bicycles and live off the land". Have you ever tried to have a rational discussion with somebody who believes in the green cause so strongly they joined a political party? I have, and it's painful -- not unlike trying to convince a religious fundamentalist that there is no god. It's all dogma.