As world population increases in tandem with our demands, the land on which we depend to feed ourselves remains constant and in many areas, rain is decreasing. Livestock are central to the livelihoods of some one billion of the world’s poorest people, some of who sell livestock products, trade in manure, get jobs in the dairy industry, to mention but a few. Livestock also provide nourishing foods for poor households in urban as well as rural areas. A major challenge is to meet that demand using the same resource base without depleting the environment.