The Energy Independence and Security Act of 2007, signed into law on December 19th, boosts the requirements for renewable fuel use to 36 billion gallons by 2022. The act requires "advanced biofuels"—defined as fuels that cut greenhouse gas emissions by at least 50%—to provide 21 billion gallons of fuel by 2022, or about 60% of the total requirement. Such advanced biofuels could include ethanol derived from cellulosic biomass—such as wood waste, grasses, and agricultural wastes—as well as biodiesel, butanol, and other fuels. Previously, a national Renewable Fuels Standard (RFS) set by the Energy Policy Act of 2005 required 4.7 billion gallons of renewable fuels in 2007, which would have increased to 5.4 billion gallons in 2008 and to 7.5 billion gallons by 2012.
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