In October 2014 the U.S. Environmental Protection Agency approved the registration of Enlist Duo, a new herbicide to fight superweeds resistant to other weedkillers. The chemical combines glyphosate, originally developed and marketed by Monsanto as Roundup, with the older, more toxic 2,4-D, one of the ingredients in Agent Orange. The approval applies to six states, and the EPA is accepting public comment until Dec. 15 to register the pesticide in 10 additional states. The registration, which came a month after the U.S. Department of Agriculture approved new corn and soybean seeds genetically engineered to resist both herbicides, is subject to a six-year limit and some monitoring requirements. Continue reading