[Serious Discussion]2012: Destiny of the Earth

[YinYin]

Anything else I forgot? Don't know.

war
you have successfully ignored the fact that our species is able to wipe itself out within days if only a few people press the wrong buttons
this is by far much more likely than anything you have listed

also for the radiation part you should've somehow mentioned the inversion of the earths magnetic field? and that our atmosphere should still block most radiation during the time where the magnetic field may collapse until it is inverted