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The 2010 Arctic sea ice melt season has ended, with sea ice extent reaching the third-lowest in the satellite record. This continues the steady decline in sea ice cover during the past few decades, which scientists attribute to emissions of greenhouse gases, as well as natural climate variability. Underscoring these rapid changes, both the Northwest and Northeast Passages were open for a time, and two sailboats set new records for transiting both of them in just one season. [Source: Reuters]
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