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On top of certifying plug-in vehicles with mpg and mpge ratings (Chevy Volt, 93 mpge; Nissan Leaf, 99) and delaying E15 decisions, the EPA is also tasked with figuring out the 2011 Renewable Fuel Standards. Today, the agency finalized the 2011 percentage standards for the four categories of fuel – cellulosic biofuel, biomass-dericed diesel, advanced biofuel and renewable fuel – that make up the agency's renewable fuel standard program, known as RFS2.

Ethanol is supposed to be a clean bio-fuel that helps reduce our dependence on foreign oil. It's primarily produced from domestically grown corn. So why is it so controversial?