The world has long produced enough calories, around 2,700 per day per human, more than enough to meet the United Nations projection of a population of nine billion in 2050, up from the current seven billion. There are hungry people not because food is lacking, but because not all of those calories go to feed humans (a third go to feed animals, nearly 5 percent are used to produce biofuels, and as much as a third is wasted, all along the food chain).