The population of the world is expected to rise to around 9.2 billion by 2050. Hans Herren (co-chair of the IAASTD) has calculated that the world currently produces enough food to feed 14bn. So no problem with production levels? Yet John Beddington et al in his Foresight Report talks of the need for 40% more food in 2o years. The FAO goes higher saying 70% more is needed by 2050. So who’s right? This article, from the Soil Association explains how some of these figures were arrived at.