No one can do this all alone. My backyard will not suffice, of course, but if many others around me are also growing food, and we share both produce and ideas on a regular basis, while working with local, organic farmers in CSAs, we would be able to meet a far larger percentage of our nutritional needs locally, rather than relying on the blatan.tly unsustainable (and hence collapsing) practices of Big Agriculture, It may not work forever, but it's a hell of a lot better than just wallowing in despair, don't you think?