Just saw this article from Grist:
http://www.grist.org/article/new-study-weighs-in-on-organicconventional-debate/
It also discussed the claim that GM foods are necessary to feed the growing world population, and cited this report as evidence against it:
http://www.ucsusa.org/assets/documents/food_and_agriculture/failure-to-yield-brochure.pdf
Organic Strawberries Come Out on Top (and GM Foods Don't)
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