The Nobel Prize winning economist Amartya Sen has reminded us that even famines are not necessarily caused by a lack of supply, but by a failure to get the food that exists to the people who need it. This was true in the Bengal famine of 1943 and in the Irish potato famine a century earlier: Ireland, controlled by its British masters, was exporting food even as its citizens died of starvation.
How to Feed the World
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).