https://www.vice.com/en_us/article/g5vabw/doomsday-clock-90-seconds-to-midnight

The Doomsday Clock, a metaphorical measure of how close humanity is to ultimate destruction, is now set at 90 seconds to midnight. This is the closest the clock has ever been set to Armageddon in its 76 year history.

The Doomsday Clock is kept by a group of scientists and experts called The Bulletin of the Atomic Scientists. It includes experts on international relations, as well as scientists who study nuclear weapons, climate, and disease. For the past two years, scientists have kept the clock at 100 seconds to midnight.