The weed-killer wars

What is glyphosate?

It’s the world’s most used herbicide, best known in the U.S. as Roundup. American farmers alone spray about 300 million pounds of it on fields annually. Such chemical herbicides have long been opposed by environmental groups and Health Secretary Robert F. Kennedy Jr.’s MAGA-aligned Make America Healthy Again movement, which claims glyphosate causes cancer and other health problems. Bayer, the German chemicals giant that makes Roundup, last month proposed a $7.25 billion...