President Trump has threatened to “totally destroy North Korea,” a terrible threat to kill 25 million people. For its part North Korea has threatened to use nuclear weapons. These provocations have gone beyond incendiary language. There have been constant weapons’ tests, war games, fly-bys, arms build-ups, and shows of force. A nuclear war in Korea would kill millions of Koreans and it could rapidly spread to other areas. Even if such a war could somehow be confined to Korea, the radioactivity and the crop failures due to the massive number of particles thrown into the atmosphere would be fatal to untold numbers of people. It must not happen.