Civilization is more fragile than most people think. Destroy enough of the infrastructure, and it won't be easy to get back. There might still be people left,

Civilization is more fragile than most people think. Destroy enough of the infrastructure, and it won't be easy to get back. There might still be people left, but it doesn't mean they'll have a good time. For more about existential risks (and how to mitigate them), check out the work of the Lifeboat Foundation (http://www.lifeboat.com http://www.lifeboat.com)