"They" can make ethanol out of pretty much any plant material right? I wonder if it would be economically viable to harvest the hundreds of thousands of acres of himalayan blackberries canes in the northwest and the kudzu down south and make it into ethanol? Not to mention all the other super fast growing noxious weeds. English Ivy, morning glory, etc. And what about the 10 trillion tons of grass clippings in the summer? I worked for a commercial landscaping company and we would dump about 10 big dump trucks full of grass every day, probably equivalent to 50 full size pickup loads. And that was just 1 company there are thousands of landscaping companies across the U.S. If all these big commercial landscaping companies could dump their grass clippings for free at the imaginary ethanol plant i'm dreaming of they could probably get more than enough material for free to run it . What do you guys think?