Well I think the sun will burn out and we will all freeze to death (probably in like a million years)
We all get a terrible anal decease and all of us burn alive in a hospital. just saying.... Seriously I think....we will all run out of water, so we will start to kill each others just to get a bit of water.
1.Most likely we nuke each other to, one single nuke could destroy the world, (chain reaction). 2.Meteor hits us an well self-explanatory. 3.ET and his buddies come raid earth for its natural resources, we get in the way, we die. Oh well, likely humanity is doomed.
Well I will rule out the Mayan theory just cause their calendar isnt really up to date with ours, we have leap years and they didn't, so the world would have ended by now My theory is either the sun burns out or a super volcano will erupt
Super volcano -.- never crossed my mind good point tho.It could happen,very realistic better the the zombie apocalypse lol