FACTBOX: U.S. presidential candidates on environment, energy
Obama would boost the renewable fuel standard to at least 60 billion gallons of advanced biofuels like cellulosic ethanol by 2030, build the ethanol distribution infrastructure, mandate that all new vehicles be "flexfuel" by the end of 2012 and seek production of 2 billion gallons of cellulosic ethanol from non-corn sources like switchgrass by 2013.
McCain favors ethanol incentives after opposing them in the past. He generally opposes subsidies and tariffs that distort the marketplace.
(Compiled by Chris Baltimore; Editing by David Alexander)
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