Planet Earth Wobbles As It Spins, and Now Scientists Know Why

Humans are responsible for some of the wobble in Earth's spin.Since 1899, the Earth's axis of spin has shifted about 34 feet (10.5 meters).Now, research quantifies the reasons why and finds that a third is due to melting ice and rising sea levels, particularly in Greenland — placing the blame on the doorstep of anthropogenic climate change.