Former Forest Service wildlife biologist Leon Fager explains how decades of livestock grazing in forests of the American West have disrupted natural fire patterns and, as a result, have changed the very structure of the forests in ways that make them more prone to catastrophic fires. This video is an excerpt from a longer interview with Fager, the transcript of which is contained in WESTERN TURF WARS: THE POLITICS OF PUBLIC LANDS RANCHING (westernturfwars.com).