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One of the BLM's highest priorities is to promote ecosystem health and one of the greatest obstacles to achieving this goal is the rapid expansion of weeds across public lands. These invasive plants can dominate and often cause permanent damage to natural plant communities. If not eradicated or controlled, noxious weeds will continue to jeopardize the health of the public lands and to constrain the myriad activities that occur on public lands. BLM Invasive and Noxious Plant Management Programs work to prevent, detect, inventory, control and monitor weed populations on public lands. 1. Invasive species cost the public millions of dollars in control and management each year and many invasive plants and noxious weeds are highly competitive and have the ability to permanently degrade our public lands. 2. Noxious weeds and invasive species expansion are recognized as the single greatest threat to our native plant communities and the values they provide us. 3. These native plant communities are essential for supporting wildlife habitat, watershed function, recreation opportunities, rural economies and working landscapes. 4. Invasive plants and noxious weeds affect plant and animal communities on farms and ranches, and in parks, waters, forests, natural areas, and backyards in negative ways. 5. Human activity such as trade, travel, and tourism have all increased substantially, escalating the speed and volume of species movement to unprecedented levels.