[bitL]

Something with wind streams partially shielding southern hemisphere from winds in northern hemisphere. So by the time fallout reaches southern hemisphere, it will be partially diluted. Of course, assuming AUS/NZ/BRA/ARG won't get nuked as well, then it might be moot.

Maybe I am overly pessimistic, but I've seen my share of corp/gov dysfunctionalities and nothing gives me any assurance current "leaders" would stop before blowing up the planet.