[Astromancer]

Try this one...

Rifting off bad climate change films with Dennis Quade in them, sudden climate change. There was a book in the 90's that claimed a hemisphere wide superstorm, lasting several weeks, would accompany climate change. The book, the title of which eludes me, depicted a more northernly area of ice ( the sudden cooling being, as in the film, a reaction to the sudden warming) than Quade's film. So the possibility that the American Southwest becomes more fertile (which is the normal pattern in ice ages) is high.

If we set the game in 2029 four years after the storm, refugees from the Northern US are still moving south. Southern society is radically transformed by both the new populations and the on going emergency measures. The USA is internally focused.

The population of Russia was driven south and conquered Ukraine, Georgia, Armenia, Azerbaijan, Iran, Iraq, Turkey, Syria, Israel/Palestine, Jordan, Egypt, and all of the Arabian peninsula. Holding these territories is a nightmare. The monsoon system has stopped and India is in the fifth year of a mega- drought. The people of Europe have fled either to North Africa or Latin America. The North Africans put up with the Europeans as a means to keep the Russians out.

China is a mass of civil wars. Korea is worse. Once it was understood they could not use blackmail anymore, Kim ordered an invasion of the South. The South won, but there was no nation left. The survivors were taken to America. Japan's population mainly fled to Latin America.

Most of the rest of the world is in economic chaos. The US government is set up in San Diego.

PCs could be aid workers trying to bring order to chaos. Salvage parties sent to bring valuable materials from frozen areas. Diplomats trying to head off crisis. Or ordinary people trying to survive.