Cengage Advantage Books: Sustaining the Earth 10th Edition by Tyler Miller,Scott Spoolman

Exercise 15

What major environmental threats affect national parks? How could national parks in the United States be used more sustainably? Describe the beneficial effects of reintroducing the gray wolf into Yellowstone National Park in the United States. What percentage of the world's land has been set aside and protected as nature reserves, and that percentage do conservation biologists believe should be protected? Describe the buffer zone concept.