Increasingly, land managers are looking to new ways to solve the problem of human waste in the backcountry, where the convenience of modern plumbing is unavailable. There are more people enjoying public lands than ever before, and that means there's more poop than ever before. Across the past decade, there's been a 15 percent increase in visits to Bureau of Land Management lands and an 18 percent increase in national parks. National park visits have topped 300 million for four years in a row. While the simple cathole method—digging a hole and burying your waste in it—may have once sufficed in many areas, the sheer volume of feces today presents a hazard to health, waterway pollution, and aesthetics; no one wants to see partially buried turds and TP when they're in the backcountry (or anywhere, really). "What tends to happen is that over time, as visitation generally tends to increase, that dispersal strategy [of digging catholes] no longer works," says Ben Lawhon, education director for Leave No Trace Center for Outdoor Ethics, an organization focused on educating the public about responsible outdoor practices.