Every year, farmers spray, on average, almost a pound of the herbicide glyphosate on every acre of cropland in the U.S., and nearly half a pound on every acre of cropland worldwide. Glyphosate is the active ingredient in Roundup, a huge source of income for its manufacturer, Monsanto Co., and the foundation for its epochal foray into genetically modified organisms. If you know nothing else about GMOs and Monsanto, know this: The St. Louis-based company reengineered the DNA of corn, soybeans, and other crops for the primary purpose of making them resistant to Roundup. [node:read-more:link]