One of the world’s most popular weed killers—and the most widely used kind in the U.S.—has been labeled a probable carcinogen by the International Agency for Research on Cancer. The decision was made by IARC, the France-based cancer research arm of the World Health Organization, which considered the status of five insect and weed killers including glyphosate, which is used globally in industrial farming. […] The new classification is aimed mainly at industrial use of glyphosate. Its use by home gardeners is not considered a risk. Glyphosate is in the same category of risk as things like anabolic steroids and...