"E.P.A. Postpones Setting Standards for Biofuel Blends" New York Times

"The market is saturated with regular corn ethanol, while production of cellulosic,
or so-called advanced, biofuel — made from nonfood parts of corn plants or
other biomass like wood waste — has fallen short of what the mandate requires refiners to use."

http://www.nytimes.com/2014/11/22/business/energy-environment/epa-postpones-setting-standards-for-biofuel-blends.html?_r=0