The "Silent Spring" of our time: scientific evidence that the active ingredient in the world’s most commonly used herbicide is responsible for a host of debilitating chronic diseases Glyphosate is the active ingredient in Roundup, the most commonly used herbicide in the world. The United States uses more of it, per capita, than any other country. Nearly 300 million pounds of glyphosate-based herbicides are sprayed on American farms—and food—every year.  Agrichemical compa