WASHINGTON (November 29, 2012)-- A new scientific study says polar ice sheets in Greenland and Antarctica are melting three times faster than they did in the 1990s and researchers blame global warming.
So far, that's only added about half an inch to rising sea levels, which is not as bad as some earlier worst-case scenarios, but scientists worry that the pace of the melt has quickened, especially in Greenland.
Until now, researchers haven't agreed on how fast the mile-thick sheets are thawing and if Antarctica was even losing ice.
Study lead author Andrew Shepherd says it is clear that Greenland's melting is a problem.
The study was released Thursday by the journal Science.