I can only speak for the situation in Germany and the silence was not the left but the conservative party CDU under Merkel. She was great for foreign relations, but her party sucked (still does too). During the 12 years they were in power they slept on all the issues, they never bothered to address climate change, we have a problem with our pension system which was always a topic, never addressed. There was a huge immigrant wave close to the end of Merkel's third term which her party completely slept on (she did take the initiative though at some point).
Now we have the social democrats, the greens and the liberals in the government, which are stuck with the dumpster fire of problems that accumulated over the last 12 years. They are working their ass off and have to make unpopular choices, which is a great attack vector for boulevard press and the opposition. CDU is super salty about not being in power anymore so they are against every change that is happening, which creates really bad vibes. Meanwhile the AfD uses the emotion and frustration to their advantage even though it is completely illogical to follow them.
So no, in Germany, the left is not the problem.
Here is a clip of a talk show where Robert Habeck of the green party explains why nuclear is not ecological:
https://m.youtube.com/watch?v=8xznqbpv0QE
I think it is clear for most people that nuclear is not sustainable and only a short term solution. Now is actually a great opportunity to push for renewable energies also because it is important to get a foot into the market before China takes it all.