So how can Coleman and Damrosch believe that adding livestock to their farm will help the planet? Cattleman Ridge Shinn has the answer. On a wintry Saturday at his farm in Hardwick, Mass., he is out in his pastures encouraging a herd of plump Devon cows to move to a grassy new paddock. Over the course of a year, his 100 cattle will rotate across 175 acres four or five times. “Conventional cattle raising is like mining,” he says. “It’s unsustainable, because you’re just taking without putting anything back. But when you rotate cattle on grass, you change the equation. You put back more than you take.”
It works like this: grass is a perennial. Rotate cattle and other ruminants across pastures full of it, and the animals’ grazing will cut the blades — which spurs new growth — while their trampling helps work manure and other decaying organic matter into the soil, turning it into rich humus. The plant’s roots also help maintain soil health by retaining water and microbes. And healthy soil keeps carbon dioxide underground and out of the atmosphere.
http://www.cornucopia.org/2010/01/ho...ve-the-planet/