Pig heads sit on a rack in a cool room at independent free-range Jonai Farms and Meatsmith in Eganstown, Australia, on Monday, Sept. 29, 2014. The world may need an extra 1 billion tons of cereals and 200 million more tons of livestock products every year by 2050 as the global population grows to 9 billion from 7 billion, according to a 2011 report by the Food and Agriculture Organization of the United Nations. Photographer: Carla Gottgens/Bloomberg via Getty Images
