"In contrast, radical environmentalists urge people to use less energy, which they believe is necessary to avert climate and ecological apocalypse."

A minor quibble -

They believe no such thing. Their concern about climate is faux, their goal is simply power and control over everyone and everything. They want YOU as their slaves.

Pertaining to nuclear power generation, the radical slavers have always opposed anything that creates freedom, and abundant energy does just that. So they have always made up falsehoods about it. Consider how much actual damage has been done by nuclear power plant failures. It might as well be zero it's such a small number. A months death toll from auto accidents in the USA exceeds it.

Nuclear is the way to go, and we need to get government out of the way. Preserve fossil fuels for their best use, portable energy. AKA gasoline, diesel, nat gas, etc.