I agree with Hugh about how bad the Yoeman's website is. The plow is a fantastic tool for sustainability, but the website has a lot of information that I strongly disagree with.  This site is maintained by the son of the man who invented the plow and I think he is doing his father's invention a disservice with his rather strange ideas. We want to preserve rainforests, vast tracks of which are food forests.  Cutting them down for timber and growing biofuels is as wrong as it can be.  I also think nuclear is a big mistake until somebody can solve waste storage and terrorist threats on nuclear plants.