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When Andy Jarvis wants to explain to locals how future climate change will affect agriculture in the tropics, he uses a familiar landmark: a mountain.

Climate change will pose major new hurdles for U.S. naval forces, forcing the military to grapple with an emerging Arctic frontier, increasing demand for humanitarian aid and creating rising seas that could threaten low-lying bases, the National Academy of Sciences said yesterday. "Even the most moderate current trends in climate, if continued, will present new national security challenges for the the U.S.