In this July 21, 2011 file photo, an iceberg floats in the sea near Qeqertarsuaq, Disko Island, Greenland. Global warming is shifting the way the Earth wobbles on its polar axis, a new NASA study finds. (AP Photo/Brennan Linsley)
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Global warming is shifting the way the Earth wobbles on its polar axis, a new NASA study finds.Since 2003, Greenland has lost on average more than 600 trillion pounds of ice a year, and that affects the way the Earth wobbles in a manner similar to a figure skater lifting one leg while spinning, said NASA scientist Eirk Ivins, the study's co-author.On top of that, West Antarctica loses 275 trillion tons of ice and East Antarctica gains about 165 trillion tons of ice yearly, helping tilt the wobble further, Ivins said.They all combine to pull polar motion toward the east, Adhikari said.
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