The Wilkins Ice Shelf, one of the northernmost points in Antarctica and one of the place on Earth that is experiencing the greatest temperature rise (over 5F in the past fifty years -- far above the global rise, which is only on the order of a degree or two). This shelf has been stable since the 1930's and is thought to have been so much longer than that (some cores indicate 10,000 years or more, but has been melting rapidly since the 90's and according to researchers is about to break free. While its melting will not affect sea levels directly (since it is already floating) if its melts, landed and glacial ice will move more quickly to the sea, and it will cause a sea level rise, though exactly how much is not really known at this point -- in fact so little was understood at the time that the 2007 IPCC report did not make a specific projection. Things are looking warm at the other pole, too. Current meetings in Bonn, Germany, which are scheduled to end Wednesday, have drawn representatives from 175 nations, hoping to agree on a new UN treaty. You can see a video and some satellite imagery on the BBC and ESA sites.
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