Scientists believe Greenland's glaciers are sliding into the ocean much faster than earlier thought, a new report says.
A study of the phenomenon was introduced at a conference in St. Louis, the BBC said. Previously, scientists believed the Greenland ice sheet could melt in about a millennium.
Details of the study by NASA and University of Kansas researchers were reported in the journal Science.
In the study, a comprehensive analysis found that the amount of ice dumped into the Atlantic Ocean has doubled in the last five years, the BBC said. If the ice sheet melted completely, it would raise global sea levels by about 7 meters (23 feet).
Scientists previously suggested it would take many hundreds of years for the Greenland ice sheet to melt completely, but the new data will cut this time line. How much it will be cut is uncertain, the BBC said.