http://www.businessinsider.com/step...he-end-of-the-world-2016-1/#nuclear-warfare-1 Basically, the most imminent threats Hawking sees are: 1. Waging Nuclear Warfare 2. Continued Global Warming Trend 3. Weaponized or Unintentional Human Engineered Viruses 4. Artificial Intelligence, autonomous weapon systems in particular. That's a pretty good roundup. Any other things we should all be worried about?