Stephen Petranek held this talk at TED in 2002, so it is not exactly crisp. But after having seen it, you have to conclude the 10 ways the world could end then, it can still end today and very little of what Petranek has suggested has been undertaken so far.
Before I embed the video, I'd like to tell how I found it. I was alerted to the talk by Peter Ward, which brought me to the site. Just as with every other TED video, there is a recommendation what to view next, what to see that takes on the same subject or elaborates on the same theme. And so I wandered off, to Martin Rees and from there to Stephan Petranek. A fine close to a TED journey.