Tim -
I'm far from an expert on this, but I think that in terms of reducing overall green house gas emissions it's important to remember the vast amount of carbon per acre that is sequestered in/by undisturbed ground, ground that for decades has had native plants/grasses growing there for example. Some (most) of the studies and numbers I read about reducing carbon emissions make my head spin - I just don't understand them. But I think I can understand the concept that an acre of, say, a perennial like switchgrass, holds undergound about 7 tons of carbon -- much of which would be released into the atmosphere if the ground was turned. All of which is to say, I'd try not to disturb the earth too much to begin with.
Tom D - a very nice story; a blend of the practical, the economic, and the sustainable all in one.
Peter