<div><a href="http://www.cbsnews.com/stories/2007/10/08/national/main3344859.shtml?source=RSSattr=HOME_3344859">http://www.cbsnews.com/stories/2007/10/08/national/main3344859.shtml?source=RSSattr=HOME_3344859</a></div>
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<div>However hot it's been lately in Chicago, this summer will be remembered for another heat wave with huge potential consequences - in the Arctic, reports <b>CBS News correspondent Mark Phillips</b>. <br><br>Satellite images, which normally show a summer melt-back of sea ice, this year recorded a sudden, unexpected and unprecedented melt-off that left open water across the top of Canada and Alaska and shocked scientists.
<br><br>"We're seeing unprecedented change," said Walt Meier of the University of Colorado's National Snow and Ice Data Center. "It's something that we probably haven't seen, you know, not just in the last hundred years but probably in several hundred and maybe even thousands of years."
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<div>Vision2020 Post: Ted Moffett</div>