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Has Arctic summer sea ice tipped?

For the long view on the 2008 Arctic sea ice melt, see today’s commentary on Nature Reports Climate Change by two National Snow and Ice Data Center researchers. Mark Serreze and Julienne Stroeve recap the results: The seasonal minimum for 2008, occurring on 14 September, entered the books as the second-lowest of the satellite era, probably the second-lowest of at least a century, and just behind the standing record set in 2007. Barely second-lowest still came as a shock, given the cooler weather this year. Said Stroeve in an NISDC press release, “I find it incredible that we came so 


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