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Clouds over the central Greenland Ice Sheet last July were "just right" for driving surface temperatures there above the melting point, according to a new study. The study found that thin, low-lying clouds allowed the sun's energy to pass through and warm the surface of the ice, while at the same time trapping heat near the surface of the ice cap. This combination played a significant role in last summer's record-breaking melt. [Source: NOAA News]
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