With warming, Arctic is losing ground

Scientists anticipate big ecosystem changes from erosion

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FALLING QUICKLY Researchers are measuring rapid erosion along the Arctic coast as ice-rich soil warms. Shown here, a chunk of permafrost in Alaska has collapsed into the water. Courtesy of Christopher Arp/USGS

Arctic coastlines — a third of the globe’s total shores — are retreating an average of a half meter annually, a 10-nation regional assessment concludes.