California to list herbicide as cancer-causing; Monsanto vows fight

Glyphosate, an herbicide and the active ingredient in Monsanto Co's popular Roundup weed killer, will be added to California's list of chemicals known to cause cancer effective July 7. Monsanto vowed to continue its legal fight against the designation, required under a state law known as Proposition 65, and called the decision "unwarranted on the basis of science and the law." Earlier this month, Reuters reported that the scientist leading the IARC’s review knew of fresh data showing no link between glyphosate and cancer. But he never mentioned it, and the agency did not take the information into account because it had yet to be published in a scientific journal. The IARC classed glyphosate as a “probable carcinogen,”  the only major health regulator to do so.