With this 70 GW nuclear power in China their annual lifecycle CO2 emissions will be around 2 million tons, as compared to 226 million tons if they went for fossil gas or 408 million tons if coal. Comes out, #nuclear reduces their #co2 impact 100-200x times.
https://www.bloomberg.com/news/articles/2021-03-05/china-gives-nuclear-power-a-fresh-push-in-the-drive-to-go-green
In case of PV and wind production, this would be respectively 11 and 5 million tons of CO2 respectively, when compensated for low capacity factor by adding extra nominal power, but ignoring additional storage which would also result in CO2 emissions.