Final answer:
National parks are becoming overrun by visitors, which creates environmental strain and infrastructural damage, but well-managed ecotourism can minimize these impacts while promoting conservation.
Step-by-step explanation:
National parks are getting overrun by visitors, and their trails are getting worn down. The pressure of tourism on these natural areas can lead to significant environmental and infrastructure strain. The beauty of America's parks, such as Yosemite National Park, is in danger as they face the challenges of overcrowding and pollution, which threaten water, food, and air quality. Despite the negative impacts, tourism managed in the form of ecotourism can be minimally damaging to the environment and can promote ecosystem conservation. However, when tourism is poorly managed, it fails to benefit local economies adequately and can be environmentally destructive. Parks and people have a much-contested relationship, and finding a balance between visitor access and conservation is critical for the future of these treasured spaces.