Consumers do not wish to eat food that has been treated with pesticides because of potential health hazards, and run-off of agricultural wastes from excessive use of pesticides and fertilizers can poison the water supply and cause harm to the environment. Growing GM foods such as B.t. corn can help eliminate the application of chemical pesticides and reduce the cost of bringing a crop to market. (Whitman, Deborah. “Genetically Modified Foods: Harmful or Helpful?” CSA 2000. http://www.csa.com/discoveryguides/gmfood/overview.php)