Meat and dairy production and consumption are in crisis. Globally, 70 billion farm animals are used for food production every year. It is well accepted that livestock production is a major contributor to greenhouse gas emissions. The Food and Agriculture Organization of the United Nations (FAO) predicts a rough doubling of meat and milk consumption in the first half of the 21st century, with particularly rapid growth occurring in the developing economies of Asia. What will this mean for the health and wellbeing of those animals, of the people who consume ever larger quantities of animal products, and for the health of the planet itself