Arctic sea ice annual freeze-up underway

After reaching the second-lowest extent ever recorded last month, sea ice in the Arctic has begun to refreeze in the face of autumn temperatures, closing both the Northern Sea Route and the direct route through the Northwest Passage.

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<p><a href="http://www.physorg.com/news142251643.html">Arctic sea ice annual freeze-up underway</a></p> <p>After reaching the second-lowest extent ever recorded last month, sea ice in the Arctic has begun to refreeze in the face of autumn temperatures, closing both the Northern Sea Route and the direct route through the Northwest Passage.</p>