U.S. oil refineries are moving aggressively to produce renewable diesel, partly to cash in on Canada’s greener fuel standard before Canadian refiners modify their own plants. Canadian Prime Minister Justin Trudeau’s government intends to present its Clean Fuel Standard this year, aiming to cut 30 million tons of emissions by 2030. Renewable diesel, made by processing spent cooking oil, canola oil or animal fats, can be used in high concentrations ...