Farmers are the "largest group of natural-resource managers on earth," according to the UN's Food and Agriculture Organization (FAO). Although crop yields have grown over the past few decades, population has, too. Even if farmers can produce 60 percent more food, there will still be 300 million hungry people in 2050, the FAO projects. Political and social instability over food has risen in recent years, including Mexico's Tortilla Riots in 2007 and Tunisia's revolution in 2011.
For many farmers, the transition from traditional agriculture to sustainable practices is too risky, costly and slow, particularly in the absence of aid and training.
Winter wheat stands in a field in Tiskilwa, Illinois, on June 12.
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