There are people who term themselves 'Eco-modernists' who are almost always pro-nuclear power:

https://en.wikipedia.org/wiki/Ecomodernism

There is also 'environmentalists for nuclear' that includes Patrick Moore, one of the co-founders of Greenpeace and James Lovelock:

https://en.wikipedia.org/wiki/Environmentalists_for_Nuclear

James Hansen, possibly the original driving force behind modern greenhouse gas concerns is also pro-nuclear.