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Greenland Is Getting Darker

Science: Greenland’s white snow is getting darker. Scientists have generally attributed that darkening to larger, slightly less white snow grains caused by warmer temperatures. But researchers have found a new source of darkening taking hold: impurities in the snow. “It can increase the speed of melting,” says Marie Dumont, a remote sensing scientist at Météo France in Grenoble, who publishes today with her colleagues in Nature Geoscience. Scientists have known for years that Greenland’s snow is getting...