What will end the world?...?

None of the above! It's as simple as this. December 23, 2012 on our calender, according to the Mayan calender December 21, 2012. From a philosophical point, considering all the civilizations that have come before us. People will bring the end of the world on themselves, probably will be caused by global warming, which will unleash new diseases and drought, starvation and pestilence, all will be accountable from global warming. People will have to change now, or the end is inevitable!