Many invasive species consume enormous amounts of water and reduce the water supply for livestock, wildlife, native vegetation, and humans. These species can change physical characteristics of land and water and alter food chains. As habitat is destroyed by invasive species, the wildlife that depends on it disappears as well. About 42 percent of the species on the Federal Threatened or Endangered Species lists are at risk primarily because of invasive species. In the United States, ecological damage and control of invasive species cost $200 billion per year and these costs are increasing. Colorado's environment draws tourists, brings business, and supports agriculture. To protect it, we must manage invasive species quickly.​