What is Doomsday Clock and why has it been set to 89 seconds before midnight?

Atomic scientists moved the ‘Doomsday Clock’ closer to midnight than ever before on Tuesday, due to Russian nuclear threats, climate change, military risks of artificial intelligence and more. The Doomsday Clock being set to 89 seconds The Bulletin of the Atomic Scientists set the clock to 89 seconds before midnight - which is supposed to represent how close the total destruction of the world is to us. Chicago-based non-profit, the Bulletin of the Atomic Scientists created the 'Doomsday Clock' amid Cold War tensions in 1947 to warn the public about how close humankind was to destroying the world. "Setting the Doomsday Clock at 89 seconds to midnight is a warning to all world leaders," Holz said.