All the green energy won't do any good if it can't get to where it's needed. Yes, we could put 3 2000 acre sites in Mexico, Australia, and Africa that would produce enough power for the entire world. Problem is, we can't transport it nearly far enough. The revolution we need isn't a green revolution, but is a transportation revolution.
Also, modern nuclear plats are perfectly safe, but don't produce fissile material. Guess how many of them we have? (No prizes for the correct answer π )