Or maybe nothing will happen

you miss the first that is at our door: biological virus

hydrogen is one of the most abundant elements in the universe the earth has a tiny amount compared with gas giants not to mention huge stellar gas clouds.

#6 Nope, no contact on March 6th.

Their calendar was circular in that it starts over. Or they ran out of room. One or the other.

Boy I'm happy now. What a depressing post...SHOW ME TITTIES!!

You forget the posibility of the contmined potable water.
I agree with orendadude, this is depressing.

i go for the supervulcanos, yellowstone, death to america!

none of those things could end the world other than a rogue black hole, which for better or worse is not worth worrying about.

but if you mean 'collapse of civilisation', look at the way countries and currencies are going bankrupt all over the world. it wouldn't take much to push that over the edge...

Snooki is pregnanat... for sure world is going to end..

Man-made global warming (aka climate change) not mentioned.

Guess that hoax jumped the shark.

...'bout time too!

most of this stuff is completely absurd. posted by someone who has no fundamental understanding of the world around them. btw @Neko... climate change... #3. ಠ_ಠ

I disagree. Most of this stuff could most certainly happen. Brush up on your science.

You forgot virus epidemic and zombie apocalypse.