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...millennium or so ago, the archipelago from Hudson Bay through Nunavut to northern Greenland was inhabited by nomadic groups we now call the Dorset people. They were, according to Inuit legend, tall and gentle folk, and they hunted from the ice edge, harpooning seals and walruses with tools made of bone and ivory. When a slight warming period hit about 1,000 years ago, the ice receded. Bowhead whales moved in from Alaskan waters, followed by seafaring hunters from the Bering Strait. With their boats, those hunters, the forebears of Canadian Inuit, eventually spread east to Greenland. For reasons still...

Author: /time Magazine | Title: Canada's Crisis | 3/27/2006 | See Source »

...North and South poles that those steambath conditions are felt particularly acutely, with glaciers and ice caps crumbling to slush. Once the thaw begins, a number of mechanisms kick in to keep it going. Greenland is a vivid example. Late last year, glaciologist Eric Rignot of the Jet Propulsion Laboratory in Pasadena, Calif., and Pannir Kanagaratnam, a research assistant professor at the University of Kansas, analyzed data from Canadian and European satellites and found that Greenland ice is not just melting but doing so more than twice as fast, with 53 cu. mi. draining away into the sea last year...

Author: /time Magazine | Title: Global Warming Heats Up | 3/26/2006 | See Source »

Dumping that much water into the ocean is a very dangerous thing. Icebergs don't raise sea levels when they melt because they're floating, which means they have displaced all the water they're ever going to. But ice on land, like Greenland's, is a different matter. Pour that into oceans that are already rising (because warm water expands), and you deluge shorelines. By some estimates, the entire Greenland ice sheet would be enough to raise global sea levels 23 ft., swallowing up large parts of coastal Florida and most of Bangladesh. The Antarctic holds enough...

Author: /time Magazine | Title: Global Warming Heats Up | 3/26/2006 | See Source »

...drops, and the water gets lighter, idling on top and stalling the current. Last December, researchers associated with Britain's National Oceanography Center reported that one component of the system that drives the Gulf Stream has slowed about 30% since 1957. It's the increased release of Arctic and Greenland meltwater that appears to be causing the problem, introducing a gush of freshwater that's overwhelming the natural cycle. In a global-warming world, it's unlikely that any amount of cooling that resulted from this would be sufficient to support glaciers, but it could make things awfully uncomfortable...

Author: /time Magazine | Title: Global Warming Heats Up | 3/26/2006 | See Source »

...reflected by ocean water ?90% reflected by ice MELTING ICE RAISES SEA LEVELS INUNDATING LOW COASTAL AREAS WASHING ASHORE The ice at the North Pole is floating, so as it melts, the sea level won't change much. But the massive ice sheets over Antarctica and Greenland are another story. If both melted completely, sea levels could rise nearly 220 ft. (72 m). That's a worst-case scenario. But the melting is accelerating, and sea levels are projected to rise gradually, threatening low-lying communities Sources: Intergovernmental Panel on Climate Change, Third Assessment Report; NOAA; NASA; National Snow...

Author: /time Magazine | Title: Global Warming: Vicious Cycles | 3/26/2006 | See Source »

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