NASA: Global warming is now changing how Earth wobbles
"The recent shift from the 20th-century direction is very dramatic," Adhikari said.
While scientists say the shift is harmless, it is meaningful. Jonathan Overpeck, professor of geosciences at the University of Arizona who wasn't part of the study, said "this highlights how real and profoundly large an impact humans are having on the planet."
Ivins said he likes to think of it as a billion trucks each year dumping ice out of Greenland. On top of that, West Antarctica loses 275 trillion pounds of ice and East Antarctica gains about 165 trillion pounds of ice yearly, helping tilt the wobble further, Ivins said.
They all combine to pull polar motion toward the east, Adhikari said.
"There is nothing to worry about," said Chen, who wasn't part of the NASA study. "It is just another interesting effect of climate change."
Author: Seth Borenstein | Source: The Associated Press [April 08, 2016]
Labels Arctic, Breakingnews, Climate Change, Earth Science, Environment, Greenland, Natural Heritage