And by “environmentalists”, you mean pseudo-environmentalist limo-liberal scum who wouldn’t know science and engineering if it booted them in the scrotum with a steel-toed combat boot.
The choice should be couched to those mouth-breathers as follows: we’re going to have nuclear. Either we keep running existing reactors, which are on average 30-40 years old and less safe than modern designs, or we build more reactors that are both safe and clean.