Originally Posted by
FFIX Choco Boy
In order of most likely to least, this is what I've come up with.
1. Ozone Layer disintegrates, and we die of radiation poisoning from Sun.
2. Nuclear War.
3. Aliens invading.
4. Rampaging machines/robots.
5. Zombie virus.
Those are all very likely, then we get to the ones that are just barely remotely imaginable.
6. Volcanoes exploding and drenching the earth in soot, changing climate so drastically we can't adjust and we die.
7. Earth gets whacked by a meteor.
8. The Sun's gravity somehow lets go of Earth and we hurtle off in space and freeze to death.
9. Giant natural disaster.
10. Mass suicide.
11. Extremist groups kill everyone.
12. Mass sacrifice to a God.
13. "Anti-Christ" end world.
14. We run out of water like Mars did.
15. The Sun explodes, engulfing Earth in a giant Supernova, instantly incinerating everything in its path.