7 world ending catastrophes where only the first is not classified:
1) Nuclear war
2) Asteroid
3) Massive solar flare
4) Earth pole shift
5) Wandering black hole
6) Alien invasion
7) Ice age
1) Nuclear war
2) Asteroid
3) Massive solar flare
4) Earth pole shift
5) Wandering black hole
6) Alien invasion
7) Ice age