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Sea ice extent falls to second lowest on record mongabay.com August 27, 2008 With several weeks left in the melt season, sea ice extent fell to 5.26 million square kilometers (2.03 million square miles), just below the 2005 minimum, which had been the second-lowest extent in the satellite record. NSIDC data shows that Arctic sea ice extent has declined 2.06 million square kilometers (795,000 square miles) since the beginning of the month and that the extent in now 1.97 million square kilometers (760,000 square miles) below the 1979 to 2000 average.
The melting set off a scramble between Canada, Russia, the U.S., Denmark, Sweden and Norway which are all seeking to claim rights to the Arctic's rich mineral, oil and gas deposits. Environmentalists are concerned that the loss of summer sea ice could have dramatic implications for wildlife -- like polar bear and walrus -- that depend on pack ice for feeding. The Arctic is particularly sensitive to changes in the extent of sea ice, which helps reflect sunlight back into space, cooling the region. When sea ice melts, the dark areas of open water absorb the sun's radiation, trigger a positive feedback loop that worsens melting. When there is less cloud cover, the effect is intensified.
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