I've studied nuclear war for 35 years -- you should be worried. | Brian Toon | TEDxMileHigh

For the first time in decades, it's hard to ignore the threat of nuclear war. But as long as you're far from the blast, you're safe, right? Wrong. In this sobering talk, atmospheric scientist Brian Toon explains how even a small nuclear war could destroy all life on earth -- and what we can do to pr...

youtube.com