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The running scientific theory has been that increased atmospheric carbon dioxide will be offset by a "greening of the land." Initial data from real world observation are suggesting the greening may not be has offsetting as initially hypothesized from lab experiments.
Changing patterns of precipitation coupled with a warming world will likely dramatically affect crop yields.
http://nyti.ms/1cOaiMO
The negative effects of global climate change on agriculture are expected to get worse, experts say, raising deep concerns about the global food supply in the decades to come.
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