The late 1990s .
ATV use throughout the forest became a concern , both because the vehicles create noise , and because they cause damage to various plants ; some indigenous plants are in danger of extirpation , while similar , hardier invasive species take over their habitat .
Since the late 1990s , ATV use throughout the forest became a concern , both because the vehicles create noise , and because they cause damage to various plants ; some indigenous plants are in danger of extirpation , while similar , hardier invasive species take over their habitat .