According to The Atlantic, Walmart is making a big push to revive local agriculture.
If I remember the NPR interview right, Walmart is somehow contracting with local farmers to grow produce within a day's drive of each participating superstore. The farmers are responsible for getting the food to a distribution center, and in return receive a premium price. Many people will recoil at the idea of Walmart leading the way back to local agriculture, but any action taken by a massive organization will have a big impact.
As my plane made its final descent into Phoenix this past Friday, I stared at miles of irrigated fields and was reminded that part of the reason Big Ag grew up in the West in the first place was the combination of long growing seasons and cheap water.* Of course, if the metastasizing suburbs continue to drink up every last drop of the Colorado and Sacramento, the West may lose its economic edge anyway...
* Did I say cheap? I meant heavily subsidized.