On a corner in Washington, D.C., where stores burned during riots 44 years ago, there's now a plaza where farmers sell produce on Saturday mornings. Dan Charles/NPR hide caption

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A security guard opens the gate at the Central Valley Meat Co., the California slaughterhouse recently shut down by federal regulators after they received a graphic video of cows being mistreated. Gosia Wozniacka/AP hide caption

itoggle caption Gosia Wozniacka/AP

A man harvests fruits of the Jatropha tree in Taabo, Ivory Coast. Jatropha, which is grown in many parts of the world, has fallen from favor as a diesel fuel substitute. Kambou Sia/AFP/Getty Images hide caption

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Sweet potato evangelist Maria Isabel Andrade from the International Potato Center drives around Mozambique in her orange Toyota Land Cruiser. Dan Charles/NPR hide caption

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President Obama and Agriculture Secretary Tom Vilsack (second from right) inspect drought-damaged corn on the McIntosh farm in Missouri Valley, Iowa. Carolyn Kaster/AP hide caption

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Potatoes come in all colors, like these Red Erik, Snowball, Cariboo, Purple Peruvian, Caribe and French Red varieties. David Cavagnaro/Corbis hide caption

itoggle caption David Cavagnaro/Corbis

These piglets on the Hardin farm in Danville, Ind., are going to cost more to feed than they will fetch at market. Dan Charles/NPR hide caption

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A supermarket's dairy case with shelves of yogurt. Benjamin Morris/NPR hide caption

itoggle caption Benjamin Morris/NPR

Egg producers and the Humane Society agree on a bill to require larger chicken cages, but the pork and beef industries fear they're next and are fighting it. Matt Cardy/Getty Images hide caption

itoggle caption Matt Cardy/Getty Images

Notice how some of these tomatoes have unripe-looking tops? Those "green shoulders" are actually the keys to flavor. pocius/Flickr.com hide caption

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Men at a slaughterhouse stand near hanging beef carcasses, late 1940s. Lass/Getty Images hide caption

itoggle caption Lass/Getty Images