Here's a guest post from Rodale Institute CEO Tim LaSalle.
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Tom Philpott is right to highlight the tremendous ecological debt we've built up by depending on nitrogen fertilizer to run our crop production system. Depending on mined and fossil-fuel produced nitrogen for our food is no more sustainable than depending on peaking oil and mountain-top removed coal for our energy.
There's no more "cheap" food and fuel, because, really, there never was. The huge irony -- currently obscured by the psychological jolt of widespread shortages of food and fuel -- is that we were just learning of how not cheap industrial food has been: