The effect of melting polar ice could delay the need for a ‘leap second’ by three years Climate change is starting to alter how humans keep time. An analysis published in Nature on 27 March has predicted that melting ice caps are slowing Earth’s rotation to such an extent that the next leap second — the mechanism used since 1972 to reconcile official time from atomic clocks with that based on Earth’s unstable speed of rotation — will be delayed by three years. “Enough ice has melted to move sea level enough that we can actually see the rate of the Earth’s rotation has been affected,” says Duncan Agnew, a geophysicist at the Scripps Institution of Oceanography in La Jolla, California, and author of the study. FILE PHOTO: Glacial ice from the Greenland Ice Sheet flows around mou...
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