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In this Dec. 1, 2009 photo provided by Aurora Expeditions, an inflatable boat carries tourists past an iceberg along the Antarctic Peninsula. In a remote, frozen, almost pristine land where the only human residents are involved in research, tourism comes with risks, for both the continent and the tourists. (AP Photo/Aurora Expeditions, Andrew Halsall) EDITORIAL USE ONLY

Antarctica tourism poses pollution threat

A rebounding tourist trade in Antarctica, one that sees roughly 35,000 visitors annually, brings along with it growing concerns over safety and pollution.