Farming is the world's greatest cause of environmental destruction - and the one we are least prepared to talk about. We have ploughed, fenced and grazed great tracts of the planet, felling forests, killing wildlife, and poisoning rivers and oceans to feed ourselves. Now the food system itself is beginning to falter. Drawing on astonishing advances in soil ecology, Monbiot reveals how our changing understanding of the world could allow us to grow more food with less farming. He meets the people who are unlocking these methods, from the fruit and vegetable grower revolutionising our understanding of fertility; to the scientists pioneering new ways to grow protein and fat. Together, they show how the tiniest life forms could help us make peace with the planet, restore its living systems, and replace the age of extinction with an age of regenesis.