The emergence of large-scale food production gave us unprecedented abundance - but at a steep and ultimately unsustainable price. Relentless cost-cutting has made our food systems vulnerable to contamination and disease. More than a billion people are overweight or obese, yet roughly the same number are malnorished. Overcrowded countries like China are already planning for tightened global food supplies. As the world veers back to a time of hunger and uncertainty, Paul Roberts explores the vulnerable miracle of our modern food economy and pinpoints the decisions we must make to avoid the coming meltdown.