Last week there was a guest on public radio who talked about all the different sources of ethanol. One thing that caught my attention was using cattails. According to the guest you can produce 7,000 gallons per acre. I know there's a lot of starch in the roots from past reading. I suppose it would also be possible to power the root digger by converting the leaves to biogas. He was hawking his book so I'm not taking his word as gospel but it sounds pretty promising just on the fuel production alone. Then when you add that cattails clean wastewater and could be used to clean livestock waste and floodwater along floodplains I can see some real promise.