Cage-free chickens in Harold Sensenig's barn near Hershey, Pa., get to roam and perch on steel rods, but they don't go outside. Dan Charles/NPR hide caption

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Gracie Shannon-Sanborn, 5, holds a sign as she joins her father Allen Sanborn (L) and members of Progressive Democrats of America at a rally in front of Rep. Henry Waxman's office on June 17, 2013 in Los Angeles, Calif. The protestors asked the congressman to vote against a House farm bill, which was defeated Thursday. Kevork Djansezian/Getty Images hide caption

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Whenever a steer or cow leaves a farm in Michigan or goes to a slaughterhouse, it passes by a tag reader, and its ID number goes to a central computer that keeps track of every animal's location. Dan Charles/NPR hide caption

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Genetically modified wheat has been discovered growing in a field in Oregon. GMO wheat is not approved for sale in the U.S. Above, a wheat field in Arkansas. Danny Johnston/AP hide caption

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At Michigan State University's Clarksville Research Station, researchers apply pollen by hand to tart cherry blossoms, in order to breed new varieties. Dan Charles/NPR hide caption

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A bee inspector checks on a frame of bees to assess the colony strength near Turlock, Calif., in February. More than 30 percent of America's bee colonies died off over the winter. Gosia Wozniacka/AP hide caption

itoggle caption Gosia Wozniacka/AP

Rice farmers in Indonesia plant rice seedlings using the "system of rice intensification." Courtesy of SRI International Network and Resources Center hide caption

itoggle caption Courtesy of SRI International Network and Resources Center

Eduardo Somarriba is a researcher at the Center for Tropical Agricultural Research and Education in Turrialba, Costa Rica. Dan Charles/NPR hide caption

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Luis Fernando Vasquez has been a coffee farmer in the central valley of Costa Rica his entire life. Dan Charles/NPR hide caption

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Workers separate beans in the coffee warehouse in Yirgacheffe, Ethiopia. Coffee originated in Ethiopia, but now grows in more then 50 countries around the world. Michael Tsegaye/Bloomberg via Getty Images hide caption

itoggle caption Michael Tsegaye/Bloomberg via Getty Images