Shaun MacGillivray | Courtesy Warner Bros. Pictures
A mother polar bear protects her two cubs from the dangers around them, in a scene from the IMAX 3-D documentary "To the Arctic."
Russia plans to patrol Arctic shipping lanes
Climate change » First commercial crossing was in 2009; 400 vessels expected to cross this season.
By ANDREW E. KRAMER
| New York Times
First Published Sep 14 2013 07:53 pm • Last Updated Sep 14 2013 10:12 pm
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