For many years, proponents of genetically modified crops have hailed them as a critical tool for weaning farmers from the dependency of toxic pesticides. The GMO-seed-and-agrichemical giant Monsanto makes the green case for its Roundup Ready crops, engineered to withstand the company's own blockbuster herbicide, Roundup.  Roundup agricultural herbicides and other products are used to sustainably control weeds on the farm.  Roundup Ready crops has allowed farmers to conserve fuel, reduce tillage and decrease the overall use of herbicides.