A matter of commonsense, a factor disappearing rapidly in our ways of life.
CO2 is not a pollutant. Other atmospheric compounds are and they can be controlled.
Nuclear, for Japan, is an obvious no-no, their nuclear radiation issues are horrendous and it is probably too late to recover from them.
Nevertheless, making them worse, even potentially, would be a strange choice.
Eventually, we need to replace fossil fuels as a power source, but not quickly.