"Cargill and Dow are the parent of companies of Cargill Dow, maker of NatureWorks PLA, a synthetic material made without petroleum and instead uses corn. While the use of this biodegradable and renewable resource is an important step toward sustainability, the company fails to inform consumers that the corn used for its products is genetically engineered. Many environmental groups are adamantly opposed to Genetically Modified Organisms (GMOs) for a host of reasons, including concerns about what would happen if GMOs manage to contaminate non-modified crops. Cargill is one of the world’s largest producers of genetically engineered corn. Critics claim that Cargill Dow products are merely another manifestation of the company’s attempts to fight the growing criticism of genetically modified organisms through greenwashing."

Quoting CoopAmerica http://www.coopamerica.org/programs/responsibleshopper/http://www.coopamerica.org/programs/responsibleshopper/company.cfm?id=217