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In this 2003 file photo provided by Subhankar Banerjee a polar bear walks in the Arctic National Wildlife Refuge. The Interior Department has declared the polar bear a threatened species, saying it must be protected because of the decline in Arctic sea ice from global warming. Interior Secretary Dirk Kempthorne on Wednesday cited dramatic declines in sea ice over the last three decades and projections of continued losses. (AP Photo/Subhankar Banerjee, File)
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