Military aggression by China or Russia
Military aggression by the U.S
Expansion of world Socialism, abandonment of Capitalism
Expansion of world Capitalism, abandonment of Socialism
Financial meltdown or Loss of stability in Europe
Financial meltdown or Loss of stability in the U.S
Superpower status shifts to China or Russia
Superpower status of U.S. strengthens
Failure to implement global environmental policies
Complete implementation global environmental policies
You'll need more then a shotgun mate
As to the asteroid, if it is big enough, the virus would be secondary to the destruction. But you are right, a comet could very well bring an alien virus, but that virus would have to be extremely tolerant to extreme heat that the virus would be exposed to during entry into the atmosphere as well as the crash of the asteroid into the Earth. Thus far, no viruses that we know of are.
Last edited by Jetboogieman; 01-05-11 at 12:08 PM.
Also, we need to legalize recreational drugs and prostitution.