Bloomberg: The European Union imposed tariffs on U.S. biodiesel to help EU producers counter American subsidies and price undercutting, threatening to raise trans- Atlantic trade tensions. The duties are to punish U.S. manufacturers of biodiesel, a type of biofuel made from vegetable oils and animal fats for use in diesel engines, for receiving government aid and selling in the EU below cost. The companies targeted include Archer Daniels Midland Co., the world’s largest grain processor, and …