Livestock have a massive impact on the environment. Nearly a third of the planet's ice-free land surface is devoted to raising the animals we either eat or milk. Thirty percent of the crops we grow are fed to animals. The latest UN Food and Agriculture Organization (UN FAO) report estimates suggest that livestock are responsible for 14.5 percent of man-made greenhouse gas emissions — the same amount produced by all the world's cars, planes, trains, and boats put together. It is also predicted that meat production is going to double in the next 40 years. Can the planet cope with our ever increasing appetite for meat, and what meat should we be eating if we want to minimize our impact on the world?