University of Minnesota, United States, researchers say crop yields are far below targets for 2050, after analyzing 2.5 million agricultural statistics. Looking at maize, rice, wheat, and soybeans, they found yield improvement grew between 0.9% to 1.6%, far slower than the 2.4% necessary to meet calorie demands.
http://www.theguardian.com/environment/2013/jun/20/crop-yeilds-world-population
Report — http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0066428
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