Gwyneth Cravens, interviewed here.

I'll admit the name didn't ring a bell, but every bit helps. Imagine the power someone like Al Gore could have if he started pushing for safe nuclear power.

Related, an interview with Patrick Moore, and an article by Stewart Brand.

It doesn't take long for a reasonable person to work out the numbers and realize that, short of a tech miracle like cheap and abundant superconductors that work at 120 degrees F, we are not going to be running Manhattan off of windmills and solar panels. Period. You don't get to pick between solar and nuclear. You get to pick between coal, gas, and nuclear.

Doesn't mean there isn't a useful role for the "alternatives" (particularly in low-density, widely-distributed uses), but they are not going to be taking up the load needed to keep a technological civilization going around the world.