The Economist. Food security ought to be at an all-time high. Advances in technology and changes to agricultural practice have led to a boom time: our capacity to produce food is extraordinary. Automation, genetic modification and mechanical processes combine to create more food for less work. As recently as 1900, 41 per cent of American workers were farm labourers; that figure now sits at 2 per cent. And in those hundred or so years, the capacity for production has rocketed skywards. In the 30 years between 1961 and 1996, global yields of maize and paddy rice increased by 50 per cent; global yields of wheat doubled in the same period. Those are three extraordinary decades of growth. So why can 2 billion of the world's 7.3 billion citizens not find enough to eat?