What is "cellulosic ethanol" and why is cleaner than regular ethanol?

What is "cellulosic ethanol" and why is cleaner than regular ethanol?

Terry Tamminen (Author & Environmental Policy Advisor) gives expert video advice on: What is a "green vehicle"?; What are "alternative fuel sources"?; How are "biodiesel" and "ethanol" created? and more...

Cellulosic ethanol is the 'bio gasoline' that's made from the stalk or the debris part of agricultural products. So right now, ethanol is made mostly from corn, but it would be much cheaper and more energy efficient if we could make it from the stalk of the corn.