Climate change is now tugging on the world’s clocks

January 7, 2026

Climate change is not only reshaping coastlines and weather patterns. It is also nudging the length of the day itself, and that is creating a new headache for the people who keep the world’s clocks in sync. A new study in the journal Nature finds that human-driven warming has delayed, but not removed, the need for a risky adjustment known as a negative leap second.

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