That's why we need a dictatorship funked.
It ain't gonna work because:
A. US Politics is all about fear these days. While there are many sensible environmentalists, what sells politically is fear.
So yeah, while our nuke plants are safe and damn secure, what sells is talking about "nuclear terrorism" in the form of attacks on them.
While many environmentalists would recognize that nuclear energy is a hell of a lot less damaging to the environment than fossil fuels, fear of the "things nuclear" gets you votes. Look how many "nuclear free" cities there are in the US. According to the laws on the books, you shouldn't be able to buy a can of brazil nuts in those places.
B. Well, politics isn't all about fear. It's also about doing the minimum amount of action to satisfy contingencies while maintaining the status quo. That's why a good environmental politician doesn't take on the oil industry, but rather the public sector; at best, you can go after a small and weak player in the private sector, such as the private citizen ("I've got it, we'll give the american citizen more economic freedom by allowing corporations to access their financial record and initiate credit transactions! They'll just love getting those $5000 dollar checks in the mail with 30% interest rates! Their neighbors will love it too!") or maybe nuclear power. Why regulate automobiles when you can add yet another restriction to a relatively minor sector of the energy economy, and appear to be "pro-environment"? Even better, Big Oil will support any effort you make in the name of "environmentalism" to render nuclear power -- the only credible threat to fossil fuel -- absolutely unprofitable. You get to be labeled an environmentalist, Dubya and Cheney get to help out their buddies, and the only ones who lose are those who have to live on this planet.
(and no, it wouldn't be much different with a change in regime.)