saying they are zero carbon footprint is not true. you have to factor in the mining of resources, building of the physical power plants, huge amounts of cement and steel, etc., backup power sources, all of the vehicles and other fossil fuel related activity used in maintenance, operation, construction, waste 'disposal,' etc. the only part of the process that's carbon neutral is the part that proponents of nuclear like to think about; the f(us,iss)ion.