Emission controls are not going to have much impact until a new generation of vastly cheaper technologies becomes available and matures, but in the meantime, geoengineering may offer some help.

Though China appears to have halted its proliferation activities, those activities suggest a more casual attitude towards nuclear weapons than one of abhorrence. Indeed, actions speak louder than words. That Beijing proliferated nuclear technology, materials, and know-how-and to relatively unstable regimes that may be less cautious about using nuclear weapons-is worrying.