I agree that we should investigate nuclear power, especially fusion as it offers an order of magnitude more energy (I remember when Greenpeace denounced ITER, I guess because it used to have Thermonuclear in the name..)
But honestly, I don't think the environmental movement has that much power to block the research.
I suspect it's just that while people like the idea of scientific and technological progress, they don't like having to pay for it.
The irony of that is not lost on me, but I suspect it is lost on them.