Glyphosate, also known by its tradename Roundup, is commonly found in rain and rivers in agricultural areas in the Mississippi River watershed, according to two new USGS studies released this month. [...] “Though glyphosate is the mostly widely used herbicide in the world, we know very little about its long term effects to the environment,” says Paul Capel, USGS chemist and an author on this study. “This study is one of the first to document the consistent occurrence of this chemical in streams, rain and air throughout the growing season.