"Corn ethanol" refers to a type of renewable fuel made from corn, a type of grain. It is used as a substitute for gasoline and is created through a process of fermenting and distilling corn kernels. Full definition
So anyway, please don't blame the push for corn ethanol on environmentalists or on those of us who would like to see serious action taken to reduce CO2 emissions. (dotearth.blogs.nytimes.com)
Although corn ethanol as modeled here emits marginally less GHGs than does gasoline, the combined climate and air quality impacts are greater than those from gasoline vehicles. (energytomorrow.org)
But the way we make corn ethanol encourages highly unsustainable agricultural practices. (theoildrum.com)