In this Dec. 3, 2009 photo provided by Aurora Expeditions, tourists paddle 

In this Dec. 3, 2009 photo provided by Aurora Expeditions, tourists paddle their kayak 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
Associated Press
In this Dec. 3, 2009 photo provided by Aurora Expeditions, tourists paddle their kayak 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
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