Massive I believe. https://www.sciencedaily.com/releases/2015/04/150401084157.htm https://www.sciencedaily.com/releases/2015/04/150401084157.h... Cattle respo

Massive I believe. https://www.sciencedaily.com/releases/2015/04/150401084157.htm https://www.sciencedaily.com/releases/2015/04/150401084157.h... Cattle responsible for 15 per cent of the greenhouse gas emissions that humans cause." It's the methane, chickens are much less damaging. The outsided damage cattle does is because if the biochemistry in the stomache, which this feed addresses (Lamb is terrible too, but less popular)