Doomsday Clock set at 89 seconds to midnight, representing threat to human existence and the planet
The Chicago-based Bulletin of the Atomic Scientists, which runs the clock, decided to move the clock one second closer to midnight because of climate change, nuclear threats and biological hazards.
Doomsday clock set at 89 seconds to midnight, closest ever to "global catastrophe"
The clock was initially set at seven minutes to midnight and has moved 25 times since then. It can move backwards and forwards, with movement away from midnight showing that people can make positive change. The hands were furthest from midnight in 1991, following the end of the Cold War, according to the Bulletin.