What they call Sustainable is a large burden on farmland. I am not sure how much organic matreal they are going to removing from farms. This should be debated. If the powers that be think that the soil is just an endless supply of fuel, they are wrong. What comes out has to be replace in some form. Petroleum based fertilizer are what are used most now. They will not make up for everything and seems a little ironic at that. Most of all you need poeple coming up with these deas that are not as smart as they think they are, Reply