As livestock eat, so they emit: Highly variable diets drive highly variable climate change ‘hoofprints’–BIG new study

The most detailed livestock analysis to date, published yesterday, shows vast differences in animal diets and emissions.

The resources required to raise livestock and the impacts of farm animals on environments vary dramatically depending on the animal, the type of food it provides, the kind of feed it consumes and where it lives, according to a new study that offers the most detailed portrait to date of ‘livestock ecosystems’ in different parts of the world.

The study, published yesterday (16 Dec 2013) in an early edition of the Proceedings of the National Academy of Sciences (PNAS), is the newest comprehensive assessment assembled of what cows, sheep, pigs, poultry and other farm animals are eating in different parts of the world; how efficiently they convert that feed into milk, eggs and meat; and the amount of greenhouse gases they produce.