The use of fertilizers accounts for approximately 50% of the yield increase, and greater irrigation for another substantial part (FAO, 2003). Current FAO projections in food demand suggest that cereal demand will increase by almost 50% towards 2050 (FAO, 2003; 2006). This can either be obtained by increasing yields, continued expansion of cropland by conversion of natural habitats, or by optimizing food or feed energy efficiency from production to consumption.
From collection: The Environmental Food Crisis - The Environment's Role in Averting Future Food Crises
Hugo Ahlenius, UNEP/GRID-Arendal