U.S. lawmakers introduced a bill on Friday to limit exemptions offered to refiners on blending biofuels after sources said the Environmental Protection Agency chief voiced disapproval about a Supreme Court ruling upholding broad use of the waiver program. Republican Congressman Randy Feenstra of Iowa and Democrat Congresswoman Angie Craig of Minnesota introduced a bill to restrict the EPA’s ability to grant waivers, after the Supreme Court overturned a lower court decision that had imposed limits. U.S. biofuel policy has been a battleground between the oil and corn industries for years. It has created a large market for corn-based ethanol that has helped farmers but petroleum refiners say it adds costs because they either have to invest in biofuel blending businesses, which smaller refiners say is not a […]