U.S. Secretary of State Hillary Clinton  urged tighter controls on cruise ships and tourists in Antarctica to prevent further environmental damage to the fragile region.

Clinton was speaking at a joint session of the Antarctic Treaty Consultative Meeting and the Arctic Council, two bodies that discuss issues at both poles.

Tourism to the Antarctic region has increased five-fold since the early 1990s as tens of thousands of people cruise during the Southern Hemisphere’s summer to see shrinking icebergs and wildlife.

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