Chapter 9, Problem 7CR

To determine

The three main key concepts of the given section. The nine strategies for sustaining terrestrial biodiversity. The percentage of earth’s land which is strictly protected from human activities at present and what percentage is demanded by ecologists. The meaning of the term ‘wilderness’ and its importance according to conservation biologists. The history of wilderness protection in the United States. The major environmental threats to national parks in the United States and around the world. The ecological benefits of the reintroduction of the gray wolf to Yellowstone National Park. The concept of the buffer zone and the way in which Costa Rica used this concept.