How Cows (Grass-Fed Only) Could Save the Planet

Jason Grow for TIME

Cattle on this Hardwick, Mass., farm grow not on feedlots but in pastures, where their grazing helps keep carbon dioxide in the ground

On a farm in coastal Maine, a barn is going up. Right now it's little more than a concrete slab and some wooden beams, but when it's finished, the barn will provide winter shelter for up to six cows and a few head of sheep. None of this would be remarkable if it weren't for the fact that the people building the barn are two of the most highly regarded organic-vegetable farmers in the country: Eliot Coleman wrote the bible of organic farming, The New Organic Grower, and Barbara Damrosch is the Washington Post's gardening columnist. At...