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The climate change frontier

Tourists in Chile's Patagonia region can see the glacial melting wrought by global warming.

A boat sails past the Serrano glacier next to Puerto Eden in the Patagonia region of Chile, Nov. 29, 2008. (Simon Gardner/Reuters)

PUERTO NATALES, Chile — In Torres del Paine, the world-class park in Chilean Patagonia, many glaciers are receding due to global warming. These ice formations help balance the ecosystem and provide drinking water to many Chileans. They're also huge draws for tourists and perfect postcard fodder. Preserving them has become an issue among park rangers and the Chilean government.