Where the Hungry Are

This map is taken from a BBC News article stating that diplomats have reached agreement on the message to be released by their principals on the occasion of Rio + 20. The article includes a slide show briefly summarizing the danger that we face in trying to continue development sustainably. I think we can be pretty sure that the area in grey in Africa in the map is also full of hungry people.  Africa needs an agricultural revolution as a major part of a long term economic growth spurt. Indeed, with so many people in Sub-Saharan Africa living on the land, it is hard to see how there could be such economic growth without significant growth in agricultural productivity.