I have some sympathy with Nelson on nuclear power. With modern reactors, safety and waste issues have changed considerably, and realistically its probably the only way we will get a significant reduction in greenhouse gases through political opposition - alternative energy sources are still not cheap enough.
At least, I'm with Peter Garrett in saying the debate needs to be seriously opened and the conservation movement can't just flatly reject it any more. Which doesn't mean building new reactors that use old designs in a tectonically unstable country is a good idea.