Nuclear power, particularly the much cheaper Thorium Reactors, are a brilliant piece of technology with one single, catastrophic, problem: Waste disposal.
If that issue could be addressed I'd be all for it. Burying the waste in a salt mine just isn't good enough.
Some people have proposed various methods of dumping the waste deep inside the Earth's mantle. The waste would melt down and become part of the planet again. The mantle is chock full of radioactive materials anyway, so this method on the face of it seems like a brilliant idea. The most promising line of investigation is that involving subduction disposal. Bury the waste deep inside a subducting fault line and allow tectonic shift to carry the waste into the mantle for you.
It's not something that a huge amount of progress has been made on, sadly.