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 still malnourished. Over-crowded 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.