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Scientists update their prediction of how close we are to the end of the world
01:52 - Source: CNN

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CNN  — 

The Doomsday Clock that has been ticking for 77 years is no ordinary clock — it attempts to gauge how close humanity is to destroying the world.

On Tuesday, the clock was again set at 90 seconds to midnight — the closest to the hour it has ever been, according to the Bulletin of the Atomic Scientists, which created the clock in 1947. Midnight represents the moment at which people will have made Earth uninhabitable. Last year the Bulletin set the clock at 90 seconds to midnight mainly due to Russia’s invasion of Ukraine and the increased risk of nuclear escalation.

From 2020 to 2022, the clock was set at 100 seconds to midnight.