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.
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
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.
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.
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.