1. Natural disasters
a. asteroid
b. super volcano - pollution from the volcano
2. disease - that can't be treated
3. WWIII or terrorists blowing up the world
4. robots - taking over most of the jobs and the wealthy not spreading the benefits
5. Capitalism - the wealth concentrating the wealth to the point society doesn't look like society anymore
6. The police state getting so much power from technology that society doesn't look like society anymore
7. virtual reality getting so powerful people don't want to live in reality anymore
8.