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If climate change is affecting weather patterns, then it follows that it will also affect global food supplies. We'll look into what might happen to crop yields around the world, which crops are at risk, and whether we should be taking any steps to alleviate future problems.

Leonard talks to Francesco Tubiello, research scientist at the Center for Climate Systems Research at the Earth Institute; and Stephen P. Long, professor of crop sciences at the University of Illinois. Also: Andrew Revkin, who covers global warming and other environmental issues for The New York Times and is author of The North Pole Was Here.