Rainbird on 14 December 2009
I doubt global warming will be an apocalypse. I don't believe that it is manmade, I agree that it's a natural thing. And a lot of people will die (billions possibly), but it will not be the end of humanity.
Zombie apocalypse is just for shits and giggles. All out nuclear war or the terminator scenario seem the most likely to me, though I'm bad at remembering stuff like this, so feel free to remind me of other scenarios 
