Via Kevin Drum, here's a long and good article in Mother Jones on the current and future state of organic and sustainable agriculture. It's challenged by some of the comments, but because it agrees with me, I think it's good. I do think he gives too much credibility to the urban agriculture possibilities and ignores the importance of market forces.
For example: "food miles". Whether or not it's more environmentally friendly to grow sheep in New Zealand and ship the resulting lamb to the UK is a question. But IMO the way to answer it is to ensure the cost of transportation includes all the externalities. In other words, a carbon tax. (I've more faith in a carbon tax than in trading carbon offsets under a "cap and trade" policy. My experience in implementing payment limitation rules suggests a tax would be better and more easily enforced.)
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