Farmers harvest a sugar beet crop in Gilcrest, Colo. Matthew Staver/Landov hide caption

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Wild bees, such as this Andrena bee visiting highbush blueberry flowers, play a key role in boosting crop yields. Left photo by Rufus Isaac/AAAS; Right photo courtesy of Daniel M.N. Turner hide caption

toggle caption Left photo by Rufus Isaac/AAAS; Right photo courtesy of Daniel M.N. Turner

Peanut plants grow on a Halifax, N.C., farm that received federal subsidies in 2011. Robert Willett/MCT /Landov hide caption

toggle caption Robert Willett/MCT /Landov

A soybean field near Campo Verde in western Brazil in January 2011. Researchers argue that enough arable land is already under cultivation to feed the planet for the next several decades. Yasuyoshi Chiba/AFP/GettyImages hide caption

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Chris Costa and one of her chickens on her farm in Downingtown, Pa. Costa and her partner, T.J., found the land for this farm through a sustainable agriculture program. Emma Lee/WHYY hide caption

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Orchards like this one in Adams County, PA, and other U.S. farms face worldwide competition for their apples and apple products due to imports. Brad C. Bower/AP hide caption

toggle caption Brad C. Bower/AP

Sens. Jeanne Shaheen, D-N.H., and Pat Toomey, R-Pa., talk to reporters about the farm bill at the U.S. Capitol in June. J. Scott Applewhite/AP hide caption

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