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New research published in the Journal of Geophysical Research: Solid Earth reveals that Earth's day length is increasing by 1.33 milliseconds per century—a rate unprecedented in 3.6 million years—driven by climate change redistributing polar ice mass toward the equator. The findings, which trace sea-level fluctuations through fossilized marine organisms back to the Late Pliocene, project that by the end of this century, the climate-driven slowdown of Earth's rotation could surpass even the Moon's ancient gravitational braking effect.