Photos: melting ice sheets
Fueled by global warming, polar ice sheets in Greenland and Antarctica are now melting three times faster than they did in the 1990s, a new scientific study says.
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An ice sheet in Greenland, which covers most of the island, is a pressing issue, researchers said.
Ian Joughin/AP
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Scientists blamed man-made global warming for the melting.
Ian Joughin/AP
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Since 1992, ice sheets at the poles have lost nearly 5 trillion tons of ice, the study said, raising sea levels by about a half inch.
Ian Joughin/AP
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