Greenland, Antarctica have lost 11,309 billion tonnes of ice since 1979, raising sea levels by 31.4 mm

Greenland and Antarctica have lost 11,309 billion tonnes of ice since 1979, raising global sea levels by 31.4 millimetres, a new assessment finds.

Faster-flowing glaciers accounted for 84% of the loss, while surface melting contributed 16%.

Scientists say the findings highlight the long-term impact of warming oceans on polar ice sheets.