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. 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. The clock isn’t designed to definitively measure existential threats, but rather to spark conversations about difficult scientific topics such as climate change, according to the Bulletin. Originally, the organization was conceived to measure nuclear threats, but in 2007 the Bulletin made the decision to include climate change in its calculations. “When the clock is at midnight, that means there’s been some sort of nuclear exchange or catastrophic climate change that’s wiped out humanity,” she said.

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Persons: Rachel Bronson, ” Bronson, Michael E, Mann, Eryn MacDonald, ”, Bronson, “, Boris Johnson, George H.W, you’re Organizations: CNN, Atomic Scientists, Midnight, Manhattan Project, Security, Sponsors, University of Pennsylvania, Union of, ’ Global Security, Bulletin Locations: Ukraine, Israel, Gaza, Glasgow, UK, Soviet Union, Iran, Paris