Since 2001, 26 atomic-bomb-scale explosions have occurred in remote locations around the world, far ...

Since 2001, 26 atomic-bomb-scale explosions have occurred in remote locations around the world, far from populated areas. This Earth Day, Tuesday, April 22, three former NASA astronauts will present new evidence that our planet has experienced many more large-scale asteroid impacts over the past decade than previously thought… three to ten times more, This, according to a new visualization of data from a nuclear weapons warning network

I wrote about this in EARTH (1980).  Defense folks have long worried about such things triggering a war.
 http://www.universetoday.com/111278/astronauts-to-reveal-sobering-data-on-asteroid-impacts/#ixzz2z6FqEBt5