Nuclear actually releases less CO2 than renewables, because renewables aren't nearly as clean as you think they are. Those solar panels and wind turbines have to be made somehow. The things needed to make solar panels and batteries aren't exactly great for the planet to mine and manufacture.

This concept of 100% clean energy is a myth, there are just more and less polluting sources. Nuclear being the least polluting, with fossil fuels being the worst, and renewables in the middle.