<a href="http://www.worldchanging.com">WorldChanging</a> has a great <a href="http://www.worldchanging.com/archives/004539.html">discussion</a> today of organic vs. nonorganic and local vs. nonlocal food.
The globalization of organic food is already well under way: at Whole Foods you can buy organic asparagus flown in from Argentina, raspberries from Mexico, grass-fed meat from New Zealand. In an era of energy scarcity, the purchase of such products does little to advance the ideal of sustainability that once upon a time animated the organic movement. These foods may contain no pesticides, but they are drenched in petroleum even so.
The history of the complex status of Whole Food and the legacy of corn in the American diet make it a pretty interesting read.