The 100 mile diet, where everything one eats is from within 100 miles is a concept consistent with the goals of a wide variety of special interest groups. It also has the advantage of providing production of the food we cannot grow for ourselves within accessible distances, at least for the intermediary term. It also provides mainstream political brownie points for those of us having problems honestly conforming to the current version of political correctness.
http://100milediet.org/This is one of the sites available and I picked this one, as the group doing it, has studied the sustainability of applying the concept to the Seatle aria. The networking and life style adjustments takes a good deal of the scramble out of preparedness.
We have been evolving towards this goal for most of the time we have been on the farm. At the very least it takes the transportation cost out of the equasion, suports the local economy and reduces our dependecy on regulatory agencies for food quality.