A corn purchaser writes on his account in northwest China in 2012. In November 2013, officials began rejecting imports of U.S. corn when they detected traces of a new gene not yet approved in China. Peng Zhaozhi/Xinhua/Landov hide caption

itoggle caption Peng Zhaozhi/Xinhua/Landov

More than 170 volunteers in the Brattleboro, Vt., area have contributed urine to the Rich Earth Institute field trials. Mike Earley/Courtesy of Rich Earth Institute hide caption

itoggle caption Mike Earley/Courtesy of Rich Earth Institute

Yonathan Zohar, Jorge Gomezjurado and Odi Zmora check on bluefin tuna larvae in tanks at the University of Maryland Baltimore County's Institute of Marine and Environmental Technology. Courtesy of Yonathan Zohar hide caption

itoggle caption Courtesy of Yonathan Zohar

A fisherman pulls a basket filled with anchovies aboard a fishing boat off of Peru's northern port of Chimbote, in 2012. Peru is the world's top fishmeal exporter, producing about a third of worldwide supply. Enrique Castro-Mendivil/Reuters/Landov hide caption

itoggle caption Enrique Castro-Mendivil/Reuters/Landov

The U.S. Geological Survey found that neonicotinoids are leaching into streams and rivers in the Midwest, including the Missouri River, shown here in Leavenworth, Kan. Dean Bergmann/iStockphoto hide caption

itoggle caption Dean Bergmann/iStockphoto

The Planters Nutmobile, seen here taking a starring turn at the Macy's Thanksgiving Day Parade, is hitting the road for a yearlong trip across the U.S. Peter Roan/Flickr hide caption

itoggle caption Peter Roan/Flickr

Maman Pye cacao, a Haitian supertree, can produce 20 times as many cacao pods as ordinary trees, and the pods themselves are denser with cacao seeds than ordinary pods. Shutterstock hide caption

itoggle caption Shutterstock

A U.S. company that supplies meat to some fast-food chains in China has pulled all of its products, some of which were chicken nuggets sold in Hong Kong, made by a Chinese subsidiary. Kin Cheung/AP hide caption

itoggle caption Kin Cheung/AP