ABSTRACT
All commentators agree that food production will have to increase substantially this century. But there are very different views about how this should best be achieved. Some still say agriculture will have to expand into new lands. Others say food production growth must come through redoubled efforts to repeat the approaches of the Green Revolution, or that agricultural systems should become organic. Traditionally, agricultural intensification has been defined in three ways: increasing yields per hectare, increasing cropping intensity (i.e. two or more crops) per unit of land or other inputs (water), and changing land-use from low-value crops or commodities to those that receive higher market prices.
