Melting ice caps cause a redistribution of large amounts of mass affecting the spin of the planet in such a way that we must compensate for it when measuring time since atomic clocks do not automatically account for the spin differences and need to be accurate to the femtosecond.
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TL;Dr
Melting ice caps cause a redistribution of large amounts of mass affecting the spin of the planet in such a way that we must compensate for it when measuring time since atomic clocks do not automatically account for the spin differences and need to be accurate to the femtosecond.