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A Study Is Retracted, Renewing Concerns About the Weedkiller Roundup

Problems with a 25-year-old landmark paper on the safety of Roundup’s active ingredient, glyphosate, have led to calls for the E.P.A. to reassess the widely used chemical.

© Seth Perlman/Associated Press

U.S. regulators consider it safe, but the World Health Organization has said glyphosate is probably carcinogenic.
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