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Interesting program, and interesting comments. We certainly cannot all feed ourselves from our own gardens; I have a patio on my small condo with tomato plants. I could consider moving to a larger property with a house and land, but I console myself with the smaller carbon footprint I make here. I thought that there was another point that could have been mentioned. During the Spinach scare a couple of years ago (preceding the recent Tomato scare) it was pointed out that all of the people who got sick from the California spinach lived in states where spinach could easily grow. By relying on factory farms in centralized locations we put our health and our environment at greater risk. And yet I see local farmland in outer suburbs being turned into townhouses and golf courses every day.
I think we turn to individual efforts such as the one the Kingsolver family undertook, because we aren't able as a community to make sustainable decisions in our zoning policies. It is hard for local governments to make decisions in the best interest of their constituents if those decisions result in fewer taxes and reduced services. Just as it is hard for individual farmland owners to turn down millions of dollars from developers.

Sustainability will never overtake self-interest as a human motivation.