In addition to the sibling comment, I'll say that environmentalists have opposed nuclear energy for half a century, despite it being far better than coal or ng in terms of emissions. I'd say that the venn diagram intersection of burners and opposition to nuclear is significant.
Environmentalism comes in at least two forms. IMO they are entirely different things.
One form is science-based and concerned with finding out how to engineer our civilization to be more sustainable and compatible with the Earth's ecosystem. That faction has been mostly either pro-nuclear or at least open to it when renewables aren't enough or aren't ready.
The other form is a romantic back-to-the-land anti-industry or even anti-civilization movement. It's opposed to nuclear because it's a "techno-fix" when the real answer must be abandonment of high technology and advanced civilization and a return to pre-industrial (or even pre-civilization Paleolithic) ways of life. For this group that's the only acceptable answer. Finding a solution to climate change that didn't involve abandoning industry or growth would be bad, since it would allow "business as usual" to continue.
Returning to pre-industrial or pre-civ times would require the deaths of billions of people, since you can't support these populations without industry, but they don't mention that. That's the quiet part.
The second group is mostly the group that has opposed nuclear power. A few have even opposed wind and solar power, believe it or not. It sounds ridiculous but look it up. You can find cases, albeit more fringe than anti-nukes.
The second group also horseshoes around to the far right in some cases. Anti-vax and general anti-medicine ideology and the idea that we need to be "natural" in everything was originally something more associated with these types of greens, but today it's part of MAGA. There'a also an offshoot known as ecofascism. Look it up, it's also a thing. Also search up "Savitri Devi," a very odd crossover figure here.