Green groups on Wednesday sued the Environmental Protection Agency over its recent approval of Dow AgroSciences' herbicide Enlist Duo, which farmers and scientists warn threatens human and environmental health.

"The toxic treadmill has to stop," said Jay Feldman, executive director of Beyond Pesticides. "EPA and USDA cannot continue to ignore the history, science, and public opinion surrounding these dangerous chemicals so that a failed and unnecessary system of chemically-dependent agriculture can continue to destroy our health and environment."

The EPA last week approved Enlist Duo for use on corn and soybean crops that are genetically engineered to survive exposure to the herbicide. Wednesday's suit charges the approval was unlawful because the agency failed to adequately consider the human impacts and did not consult with the Fish and Wildlife Service.