Warming temperatures from 1981 to 2002 reduced the combined production of wheat, corn, barley and other crops by 40 million tonnes per year, according to the peer-reviewed study published in Environmental Research Letters on Friday.
"Most people tend to think of climate change as something that will impact the future," said Christopher Field, a co-author on the study and an ecology expert at the Carnegie Institution in Stanford, California. "This study shows that warming over the past two decades has already had effects on global food supply," he added.
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