IPCC and UNECE assessments place nuclear among the low-greenhouse-gas-emission sources over the lifecycle, comparable to wind and far lower than natural gas. Gas emits CO2 during combustion and may involve methane leaks along the supply chain. Nuclear has other impacts, such as mining, waste, and water use, but it is not correct to say it pollutes more than gas in terms of CO2/kWh.
All FAQ
31.
Does nuclear energy pollute more than natural gas?
False if referring to lifecycle climate-altering emissions.
