It could be much harder than we thought to feed everyone in a warmer world. Hot spells are cutting wheat yields In northern India, and models of global warming's effect on crops may have underestimated the problem by a huge amount.David Lobell of Stanford University in California used nine years of satellite images to track when wheat in the Ganges basin of India turned from green to brown, a sign that the plants had aged and the grain was no longer growing.He found the wheat turned brown earlier when average temperatures were higher.
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