Nuclear power is fine, and resources propably isn't a problem. When we are out of uranium-235, which at this pace will take us quite awhile, I am sure we have learned to utilize other materials.
Nuclear-power may be the best energy source in the universe, fussion and fission.
There are atoms everywhere, they are full of internal energy, we just need to harvest it better. Since atoms happen to be everywhere where we can exist, there are infinite possibilities for nuclear power.
It would be foolish to say it is not for us to use. Should we humans master the art of nuclear-power, it will be worth it even if it takes a whole continent of radioactive wasteland deserts. Or maybe a whole planet?