I was trying to fall asleep last night when one of my favorite specials aired on the History Channel- "Last Days on Earth". I hadn't seen it in awhile so I stayed up to give it another watch. It's actually pretty interesting. It gives a top 7 countdown of different ways the Earth could end (the first example they actually give two possibilities). Here is the order in which they are viewed:

7. The death of a star (in which a gamma ray burst or a black hole destroys Earth)
6. We make machines smarter than humans and they take over and turn on us
5. A supervolcano (the focus was on Yellowstone Park)
4. A large asteroid demolishes us
3. Nuclear war (most likely between the US and Russia who have the vast majority of nuclear weapons)
2. A killer plague
1. Climate change

I was always a little disappointed with climate change being #1. I mean, that's kinda boring right? I think the coolest one of these scenarios has to be all of Yellowstone erupting in a supervolcano that spews at least 8,000x the ash and lava of Mt. St. Helens. Followed shortly by the entire Earth catching on fire. Pretty sick.

There are a few corny parts where it shows things such as closeups of people's faces while they are being asked "What would you do if you knew when you were going to die?". But, all in all I recommend watching the show if you see it flipping through your guide. Just remember, we're all going down in 2012 and it's very possible by one of these 7 examples!