In a post fossil fuel economy, and assuming CO2 from concrete manufacture is captured, CO2 emissions are zero.
The question of CO2 emission before then, as fossil fuels are being phased out, is less important. During that process the better question is how much CO2 emission can be avoided per $ invested. By that metric, renewables will be much better than new nuclear.
The question of CO2 emission before then, as fossil fuels are being phased out, is less important. During that process the better question is how much CO2 emission can be avoided per $ invested. By that metric, renewables will be much better than new nuclear.