Doomsday Clock Moves Closer to Midnight

The world is nudging closer to nuclear or environmental apocalypse, a group of prominent scientists warned Wednesday as it pushed the hand of its symbolic Doomsday Clock closer to midnight.

The clock, which was set two minutes forward to 11:55, represents the likelihood of a global cataclysm. Its ticks have given the clock's keepers a chance to speak out on the dangers they see threatening Earth.