Based on the map everyone should be heading to Africa and South America but I believe South Africa and Brazil are nuclear nations with the ability to produce nuclear weapons if they haven't already done so.
International Level: Activist / Political Participation: 34 3.4%
Smoke from nuclear war would devastate ozone layer, alter climate. The massive columns of smoke generated by a nuclear war would alter the world's climate for years and devastate the ozone layer, endangering both human health and food supplies, new research shows. The international study draws on newly developed computer climate modeling techniques to paint an even grimmer picture of a global nuclear war's aftermath than previous analyses. Source 3a.