Both nuclear fission and fusion release the tremendous amounts of energy trapped in matter. When it was first proposed, scientists thought this energy would be so abundant that is would be free. Today after more than 55 years of research and development nuclear energy remains expensive, but it is far more expensive than it seems. No greenhouse gases are created during the energy generation process. A fairly safe location for a nuclear generator is 93 million miles away and we already have one.
Uranium ore is fortunately a limited resource and it belongs in the ground.
It was created by the bodies of billions of bacteria which absorbed the high levels of radiation which existed on earth millions of years ago. They died and sank to the bottom of the ocean thereby removing the radioactivity from the atmosphere and allowing life as we know it to flourish. Now we are reversing this process, digging it up and spreading it around again. Mining uranium is a health risk for the workers, their families and friends. The workers and their families and society at large picks up these costs.