Worldwide biofuel production has increased, with the main source being corn-based ethanol. This has driven up corn prices in the U.S. (a large producer) and created problems for countries that heavily rely on U.S. corn imports, such as Mexico. In 2007, tortilla prices soared 70 percent in that country, and riots broke out. Eventually the government stepped in to control costs, but similar situations could arise in the coming years as we increasingly turn to food as a source of fuel. By 2050 we'll need to feed two billion more people. Click here for a special eight-month series exploring how we can do that—without overwhelming the planet: food.nationalgeographic.com. Watch more Food by the Numbers videos: www.nationalgeographic.com/foodbynumbers/ GRAPHIC: Álvaro Valiño, Lawson Parker, and Kelsey Nowakowski ANIMATION: Native to Noise, Nico Puertollano, Clarissa Gonzalez, Megan Palero, and Angelo Cuyegkeng PRODUCER: Katwo Puertollano SOURCES: Timothy A. Wise, Tufts University; FAO; USDA Economic Research Service; and International Energy Agency

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