I do build nuclear weapons, but do not generally use them, as conventional warfare fulfills my purposes without pollution. They are there as a deterrent, and are used only to utterly destroy an enemy.
Once, a while back, I did inflict nuclear punishment upon the foe to an almost realistic extent- Hit their 12 cities with about 200 nukes. It took a while to build them, and after the first 6 strikes on the same city, there isn't any additional pollution. It was mainly an exercise in pedantry, upon reflection.