The same thing that I told you when you asked this question earlier today.
What Would You Do If The World Ended Today?
Umm... Die.
Well I didn't see this question earlier so I'd eat pizza in a T shirt and my underwear while dancing in front of a mirror and singing the song time after time into my hair brush in front of a full length mirror . I did that last Sunday and was a good night for being alone. I like hang with myself sometimes. Time after time :)
The same thing I do most days: Not a hell of a lot.
I would create a machine that could take me and my family and friends to a safe spot in the universe.