What are the three key concepts for this section? What are seven strategies for sustaining terrestrial biodiversity? What percentage of the world’s land has been set aside and protected as nature...

What are the three key concepts for this section? What are seven strategies for sustaining terrestrial biodiversity? What percentage of the world’s land has been set aside and protected as nature reserves, and what percentage should be protected, according to conservation biologists? What is wilderness and why is it important, according to conservation biologists? Summarize the history of wilderness protection in the United States. What are the major environmental threats to national parks in the world and in the United States? Describe some of the ecological effects of reintroducing the gray wolf to Yellowstone National Park. Why do ecologists support the establishment of large nature reserves and habitat corridors to connect nature reserves? What is the buffer zone concept? How has Costa Rica applied this approach?