Just wondering what the general opinion is about which event you think is most likely.

Short term natural disaster, like snowstorm that cuts power for weeks
Nukes/terrorist attacks
economic meltdown/dollar collapse
global cooking, er, I mean warming, er, I mean climate change.
Govt. clampdown on civilians
meteor strike
aliens from outer space attack
Plague that wipes out large number of people

I'm going to go with economic problems, maybe a collapse of the dollar down the road.