Congress established regulars under the Energy Policy Act of 2005 intended to encourage the mixing of renewable fuels into our nation's motor vehicle fuel supply. Congress supported the renewable fuels program under the Energy Independence and Security Act of 2007 to contain particular annual volume standards for complete renewable fuel and also for the fixed renewable fuel groups of biomass-based diesel, biofuel, and advanced biofuel. The reassessed statutory requirements also incorporate new criteria for both renewable fuels and for the feedstocks used to produce them, including lifecycle greenhouse gas emission thresholds.