A hidden trove of historical crop yield data from Africa shows that corn — long believed to tolerate hot temperatures — is a likely victim of global warming. Stanford agricultural scientist David Lobell and researchers at the International Maize and Wheat Improvement Center (CIMMYT) report in the inaugural issue of Nature Climate Change that a clear negative effect of warming on maize — or corn — production was evident in experimental crop trial data conducted in Africa by the organization and its partners from 1999 to 2007…

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