GEF

Unit 4   |  The Global Ecosystem 103 6. When used in fertilizer, which of these elements can eventually lead to eutrophication (decreased oxygen levels that kill off aquatic organisms)? a. Carbon b. Hydrogen c. Nitrogen d. Sodium 7. Which of the following is an example of an ecosystem? a. A biological community of plants, animals, and other organisms in combination with their environment b. A recycling program c. A village of people living in harmony with nature d. A large group of migrating birds 8. Why is having an understanding of ecosystem services important in sustainability? a. Valuing the services that communities provide helps us make more sustainable decisions. b. Valuing the services that economies provide helps us make more sustainable decisions. c. Valuing the services that nature provides helps us make more sustainable decisions. d. Valuing the services that policy provides helps us make more sustainable decisions. 9. Which approach emphasizes the integration of various parts into a whole and the connections between the parts? a. A systems thinking approach b. A social awareness approach c. An environmental literacy approach d. An economic approach 10. How is the iceberg model a useful tool in sustainability? a. It illustrates the importance of seeking the underlying causes of an issue. b. It emphasizes the ecological effects of melting sea ice. c. It provides a way to chart ecological successes. d. It helps scientists learn about melting icebergs.