A soybean field near Campo Verde in western Brazil in January 2011. Researchers argue that enough arable land is already under cultivation to feed the planet for the next several decades. Yasuyoshi Chiba/AFP/GettyImages hide caption toggle caption Yasuyoshi Chiba/AFP/GettyImages The Salt Peak Farmland? Some Researchers Say It's Here December 19, 2012 A new study conflicts with predictions by the United Nations on how much land farmers will require to feed humanity in 2050. The starkly different visions of the future come down to a few key assumptions about supply and demand for food.