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The USDA has just released the latest figures on planting of genetically modified soybeans, corn, and cotton in the United States. GM varieties comprise 60-70% of all corn and cotton, and 90% of soybeans. On this basis, if a food containing corn or soybeans is not labeled Certified Organic or GM-free, you should assume it is GM.
(posted from Scagway, en route to fairbanks)