food productivity is already in decline due to human-made climate change. One recent Cornell University–led study found that global crop production today is 21 percent lower than it would have been without climate change. The losses were higher for warm regions—such as Africa, Latin American and the Caribbean—than for cooler regions such as North America and Europe. But as long as the heat keeps rising, the overall decline in crop productivity is likely to continue. For every degree Celsius of increase in global mean temperature, yields are expected to decrease by 7 percent for corn, 6 percent
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