actually there is alot more to it than just the end of the world... look it up, it really is quite fascinating...
it has to do with orbiting planets and alignments...
supposedly happens on a schedule and last time resulted in the ice age....
not saying it will or wont, but i do find it fascinating, and figure if it is, it is, if it aint it aint... not alot of point in worrying about anything that can not be controlled :D