Guardian: One small mystery that surrounds Greenlands melting ice is a little closer to being solved as scientists in the US confirm that surface meltwater can drain all the way down to fill concealed lakes under the ice.
This means that atmospheric warming can reach thousands of metres below the ice sheet - warming the glacial base and potentially increasing its rate of flow.
One group, led by geologist Michael Willis, of Cornell University, and another team led by glaciologist Ian Howat, of Ohio State...