Melting ice sheets changing the way the Earth wobbles on its axis, says Nasa

http://www.theguardian.com/environment/2016/apr/09/melting-ice-sheets-changing-the-way-the-earth-wobbles-on-its-axis-says-nasa?utm_source=esp&utm_medium=Email&utm_campaign=GU+Today+USA+-+Version+CB+header&utm_term=166240&subid=14675834&CMP=ema_565
"Since 2003, Greenland has lost on average more than 272 trillion kilograms 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 124 trillion kgs of ice and East Antarctica gains about 74 trillion kgs of ice yearly, helping tilt the wobble further, Ivins said."