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The Doomsday Clock has ticked 20 seconds closer to midnight.

The clock is a symbol of how close we are to “destroying our world” using “dangerous technologies of our own making,” according to the Bulletin of the Atomic Scientists, the nonprofit organization and publication that controls the clock. The closer it moves to midnight, the closer we are to Armageddon.

When the clock was created in 1947, the dangers were mostly about nuclear weapons proliferating after World War II. But in the decades since, the definition has expanded to include climate change and other disruptions caused by humans.

Recently, the Bulletin moved the Doomsday Clock forward, from two minutes to 100 seconds to midnight.