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They're the ones who lied about climate change. They also funded anti-nuclear propaganda.
Here in Italy for example they never held power, but they did a huge lobbying and advertising campaign just AFTER Chernobyl that lead to a referendum whose result essentially forbids nuclear power in Italy.
Holding power is irrelevant
And 30% is a huge chunk of the emissions
You're very misguided in trying to place the blame of the climate crisis entirely on the only ecologists in politics.
Until very recently, all major right-wing parties were insisting that climate change wasn't real and that we should "drill, baby, drill" or burn "clan coal". Do you think they share a part of the blame or is that on the Greens too?
And lastly, building nuclear plants is all well and good, but it is meaningless if it's only added capacity. Same with solar. We have to close coal and oil plants, or all of this is useless. You should start advocating for that instead.