Dairy cows feed through a fence at an Idaho farm, in this 2009 file photo. Idaho's Gov. C.L. "Butch" Otter enacted a bill Friday that criminalizes the act of secretly filming animal abuse at farms. Charlie Litchfield/AP hide caption

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Benny Bunting, a farm advocate for Rural Advancement Foundation International-USA, in front of one of his old chicken houses in Oak City, N.C. Dan Charles/NPR hide caption

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Economists say small-business owners — especially farmers dealing in high volume and low profit margins — are more likely to accept a volatile currency like Bitcoin than bigger businesses. Allen Sheffield/Flickr hide caption

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At Happy Boy Farms near Santa Cruz, Calif., Early Girl tomatoes are grown using dry-farming methods. The tomatoes have become increasingly popular with chefs and wholesalers. Courtesy Jen Lynne/Happy Boy Farms hide caption

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An irrigation pivot waters a corn field in Nebraska. Many farmers in Nebraska and Kansas rely on irrigation to water their corn fields. But the underground aquifer they draw from will run dry. Nati Harnik/AP hide caption

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Picker Erika Nicolas Garcia, 18, fills her pail at a blueberry farm near Hillsboro, Ore. Anna King/Northwest Public Radio hide caption

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Scientists with the U.S. Geological Survey sample water in Goodwater Creek, Mo., for pesticides and other chemicals that may have run off from the surrounding land. Abbie Fentress Swanson/Harvest Public Media hide caption

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Prehistoric "pantries": This illustration is based on archaeological findings in Jordan of structures built to store extra grain some 11,000-12,000 years ago. Illustration by E. Carlson/Courtesy of Dr. Ian Kuijt/University of Notre Dame hide caption

toggle caption Illustration by E. Carlson/Courtesy of Dr. Ian Kuijt/University of Notre Dame

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