Why not bet for nuclear energy?

The transition to renewable energy must be achieved as soon as possible, regardless of the fact that fossil fuel reserves will decline inexorably,CO2 emissions in the atmosphere must be reduced, because they are the cause of the greenhouse effect and accelerate climate change. Regarding nuclear fission, its environmental cost is too high because its radioactive waste has an average life of many thousands years. It is also based on the use of a limited source, the uranium, a rare element on Earth, so it would not solve the problems of energy dependence regarding the uranium-producing countries.