End of the world
Just watched the Mat Lauer EOW feature on Scifi.
Very entertaining, they covered just about everything from global warming to gamma ray burst to extermination by AI, etal. I found it interesting that in the end the foremost threat was death by NEO.
The segment on global warming was complete with commentary by Al Gore and ominous prognosis but after all that, a asteroid/comet is more likely to get us.
Overall, a pretty fair assessment.