Nuclear power produces waste that is dangerous for thousands of years. How can anyone say, with a straight face, that they have a plan for that? All of us will be dead and every government in the world will have changed. Our current languages won't be spoken anymore. The location of the waste deposits will likely be forgotten. There is absolutely no way to predict what will happen to the waste, and it seems awfully selfish to foist that kind of problem on people in the future to solve our very short-term energy needs.
If there is a form of nuclear power that completely expends its fuel to the point where its demonstrably not dangerous TODAY, or if we can launch the waste into the sun, I'm all for it. But lets not pretend we can control the damage from things that will persist for thousands of years after we're dead.