Hey, look at all the predictions!
Maybe us humans will cause major global warming, with more water from melting glaciers and more heat, bacteria and diseases will grow and breed at super speed. thus we have SUPER-FLU! Super flu will spread fast and many will die, maybe the symptoms will include a horrifyingly slow death. Many kicked out of there home will wonder sickfully howling for help, food, or relief. They will be just like ZOMBIES!
In uber fear of zombies and super flu,the idiots (99.3 % of the human population) will be thrown into panic, which always leads to some kind of fire witch will with much rubble to burn, spread quickly.
Now with the extreme temperature shifts and water levels the magnetic core will shift slowly and surely until it hits a breaking point and the earths surface shifts around the core (witch happened in the beigning of the world.) and mass earth quakes and tsunamis.
the magnetic shifts will cause the earths gravitational force to shift and ply away from the sun, causing a ice age, the will shift back anf fourth between seasons because of a asteroid like rotation around the sun!
By then everything will be dead! :D