The Doomsday Clock, a symbolic representation of humanity's proximity to global catastrophe, is set annually by the Bulletin of the Atomic Scientists. The clock's hands reflect assessments of existential threats, primarily nuclear weapons and climate change. The latest setting, announced in January 2024, put the clock at 90 seconds to midnight, the closest it has ever been to global catastrophe.

The clock's setting is determined by the Science and Security Board, comprised of scientists and policy experts. They evaluate global events, including arms races, political tensions, and environmental concerns, to determine the level of threat. The board's decisions are meant to raise public awareness and encourage action to reduce risks. The clock's origins trace to the aftermath of the Hiroshima and Nagasaki bombings.

The Bulletin of the Atomic Scientists, founded by Manhattan Project scientists, uses the clock to communicate the dangers of the nuclear age. It serves as a stark reminder of the potential for self-destruction. The clock's influence extends beyond science, inspiring art and appearing in media. It is a powerful symbol, both praised and criticized for its message.

Looking ahead, the clock's future settings will likely reflect ongoing global events. With rising geopolitical tensions and climate change accelerating, the clock's time will be closely watched. The Bulletin hopes to influence policymakers and the public to reduce these existential risks. This is a vital and ongoing conversation for global safety.