Doomsday Scenarios

When the Soviet Union developed nuclear weapons, the magazine Bulletin of the Atomic Scientists created the Doomsday Clock. As the prospect of nuclear war gets more likely, the minute hand gets closer to midnight. In January, when this program first aired, the hand was moved from seven minutes until midnight to five—the closest it's been since the Cold War. But there's a new twist: global warming has been added as an imminent threat to human kind.