Genetically modified to be enriched with beta-carotene, golden rice grains (left) are a deep yellow. At right, white rice grains. Isagani Serrano/International Rice Research Institute hide caption

itoggle caption Isagani Serrano/International Rice Research Institute

An Argentine farmer stands by his field of trangenic soy, designed for resistance to drought and salinity. Juan Mabromata/AFP/Getty Images hide caption

itoggle caption Juan Mabromata/AFP/Getty Images

Farmer Richard Wilkins, a firm believer in genetically modified crops, examines the corn crop at his farm in Greenwood, Del. U.S. and EU officials begin talks Monday on an ambitious free-trade agreement. One stumbling block is agriculture. Unlike the U.S., the EU bans the cultivation of genetically modified crops. Jackie Northam/NPR hide caption

itoggle caption Jackie Northam/NPR

A woman sells bananas at the Kampala Airport. Ugandans eat about a pound of the fruit, on average, per day. Ronald Kabuubi/AP hide caption

itoggle caption Ronald Kabuubi/AP

While lots of labels tout their lack of genetically modified ingredients, if California's Prop. 37 succeeds, foods containing GMOs would have to be labeled. Paul Sakuma/AP hide caption

itoggle caption Paul Sakuma/AP

Central Illinois corn and soybean farmer Gary Niemeyer readies his genetically modified seed corn for spring planting at his farm near Auburn, Ill. Seth Perlman/AP hide caption

itoggle caption Seth Perlman/AP

Italian farmer Giorgio Fidenato picks up what's left of his genetically altered corn after anti-GMO activists trampled it, back in 2010. Paolo Giovannini/AP hide caption

itoggle caption Paolo Giovannini/AP