we have been slowly killing earth for ages by polluting, exhausting natural resources etc. This is the ultimate end but something might come before that, all it needs is a large asteroid or huge solar burst and whoosh.. we are gone.
Statistically looking it's more likely that something else will kill us in the meantime. It could just be as simple as an asteroid. We can't stop those remember. yeah, unless obama comes up with something like (landing on the asteroid in bugatti space shuttle, drilling 100m hole with hilti drill bits and blowing it to pieces detonating a russian nuke) armageddon style
