The International Agency for Research on Cancer, part of the World Health Organization, has classified glyphosate—commonly known as Roundup—as “probably carcinogenic to humans.” Glyphosate is one of the world’s most widely used herbicides, used in growing corn, soy, vegetables and fruits and in winemaking and home gardens. It has been used in forests to clear underbrush, in cities to deter pavement weeds and on railroad tracks to kill unwanted vegetation. It is used on sugarcane to…