Polar ice is melting and changing Earth's rotation. It's messing with time itself

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One day in the next couple of years, everyone in the world will lose a second of their time. Exactly when that will happen is being influenced by humans, according to a new study, as melting polar ice alters the Earth’s rotation and changes time itself.

Flowing water from melting ice in Scoresby Fjord, Greenland, on August 12, 2023. One day in the next couple of years, everyone in the world will lose a second of their time. Exactly when that will happen is being influenced by humans, according toThe hours and minutes that dictate our days are determined by Earth’s rotation. But that rotation is not constant; it can change ever so slightly, depending on what’s happening on Earth’s surface and in its molten core.

“Part of figuring out what is going to happen in global timekeeping … is dependent on understanding what is happening with the global warming effect,” said Duncan Agnew, professor of geophysics at the University of California San Diego and the study’s author. But as the rotation speed is not constant, the two timescales slowly diverge. This means a “leap second” must be added every now and then to bring them back into alignment.

But what is clear, according to the study, is that despite polar ice melt exerting a slowing influence, overall the Earth’s rotation is speeding up. That means the world will soon need to subtract a second for the first time. “It’s a ‘yikes’ moment for some computer applications,” he told CNN, but for most people life will carry on as usual.

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