Earth speeds up

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Climate change can also affect the Earth’s spin. Previously, Felix Landerer of NASA’s Jet Propulsion Laboratory in Pasadena, California. and colleagues showed that global warming would cause Earth’s mass to be redistributed towards higher latitudes. Since that pulls mass closer to the planet’s spin axis, it causes the planet to rotate faster – just as an ice skater spins faster when she pulls her arms towards her body.
New Scientist 20 Aug 2009