Corridor Business Journal: The Iowa Corn Growers Association is protesting an Environmental Protection Agency announcement that it will grant 31 of 38 small refinery exemption waivers from the Renewable Fuel Standard, arguing that the decision negatively affects ethanol demand. "The RFS could be one of the most effective energy policies in our country's history, but the waivers gut the policy and destroy corn demand for farmers that are faced not only with challenges from Mother Nature but market destruction,” Curt Mether, president of the Iowa Corn Growers Association and a farmer from Logan, said in a release.