More than 82,000 feral horses roam U.S. public lands, about four times as many as the land and water can sustain. Almost all of them live in Nevada, the most arid state in the union, where their impacts are almost unimaginable: desertification and massive loss of wildlife, ranging from pollinators and other insects to sage grouse, elk, mule deer and pronghorn. The Bureau of Land Management is doing what it can to address this crisis, but the agency finds itself in an impossible position ...