The last ranch

In the small ranching community of Colorado's San Luis Valley, spread out on the flats between the Sangre de Cristo range and the continental divide, Donnie Whitten and his family are trying to change their world. Faced with the slow desertification of once-prime cattle country, the Whittens and their neighbors are forging a new path in the management of their land, finding alternative and often radical measures to stop the coming desert. As their entire way of life is threatened, they begin to tackle one of the world's most pressing environmental problems. In this absorbing chronicle, Sam…