Made from a diverse mix of resources such as recycled cooking oil, soybean oil and animal fats, biodiesel and renewable diesel are better, cleaner fuels that are available now for use in existing diesel engines without modification. The National Biodiesel Board is the U.S. trade association representing the entire biodiesel and renewable diesel value chain, including producers, feedstock suppliers and fuel distributors. NBB member Renewable Energy Group is leading the energy industry's transition to sustainability by transforming renewable resources into low-carbon fuels.