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Video: Ominous Arctic Melt Worries Experts-Artic Sea Ice May disappear by 2012


WASHINGTON (AP) — An already relentless melting of the Arctic greatly accelerated this summer, a warning sign that some scientists worry could mean global warming has passed an ominous tipping point. One even speculated that summer sea ice would be gone in five years.
 
Greenland's ice sheet melted nearly 19 billion tons more than the previous high mark, and the volume of Arctic sea ice at summer's end was half what it was just four years earlier, according to new NASA satellite data obtained by The Associated Press.
 
"The Arctic is screaming," said Mark Serreze, senior scientist at the government's snow and ice data center in Boulder, Colo.







Icebergs float in a bay off Ammassalik Island, Greenland, in this July 19, 2007 picture.

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