With their four-chambered stomachs and insatiable desire to nibble on anything even resembling a plant, goats are gaining credibility as land clearers. As a result, the U.S. environmental movement has come up with a novel way to destroy large extensions of invasive weeds and grasses: Rent a Goat. So far, the results look like a win-win situation for all. Producer Zulima Palacio has the story. Mil Arcega narrates.