Experts agree that finding ways to boost the output of Africa's 80 million smallholder farmers will be crucial. What they disagree on is how.
Many argue that genetically modified crops and more powerful technology-continuing the methods of the "Green Revolution" of the last century-is the way forward.
But Mr. De Schutter disagrees. Instead he says ecological methods which enhance soils productivity and protect crops against pests by relying on beneficial trees, plants, animals and insects will be more sustainable and effective by helping boost production in emerging nations, where demand is greatest.
"There has been an attempt to relaunch the new agricultural revolution these days but its really very financially unsustainable for farmers," he said. "Those who are hungry today are those who have very small farms to cultivate. We need to help them to produce in ways without expensive agricultural inputs."