Scientists move the Doomsday Clock to 89 seconds before midnight, calling on the U.S., China and Russia to address global risks.

Atomic scientists on Tuesday moved their "Doomsday Clock" closer to midnight than ever before, citing Russian nuclear threats amid its invasion of Ukraine, tensions in other world hot spots, military applications of artificial intelligence and climate change as factors underlying the risks of global catastrophe.

Today, the Doomsday Clock was set to 89 seconds to midnight, signaling that experts fear we are dangerously close to a global catastrophe.

At 89 seconds to midnight, the Doomsday Clock is now the closest it has ever been to midnight, much closer than it was during the peak of the Cold War

A science-oriented advocacy group advanced its famous clock to 89 seconds Tuesday, the closest it has ever been.

The Bulletin of Atomic Scientists announced Tuesday that the "Doomsday Clock" is now set to 89 seconds to midnight.