The number of U.S. field trials of genetically modified crops has climbed since the mid-1990s. But the number of new biotech crops approved by the U.S. Department of Agriculture has declined in the same period, and many of the crops being submitted for review have the same traits as existing products, according to a recent report by the nonprofit Center for Science in the Public Interest. What's more, regulatory review times have doubled, exacerbating the dearth of novel submissions.
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