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The extraordinary Retreat of Arctic Ocean Sea Ice, 2007
In September 2007, the sheath of floating sea ice on the Arctic Ocean pulled back far beyond the average minimum measured since satellites have kept track starting in 1979. Many experts foresee a similar, if not bigger, retreat in 2008. Visit svc.gsfc.nasa.gov and nytimes.com/climate for more background. email dotearth @ nytimes.com