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The critical environmental problems of today can ultimately be traced to a. the demands of a rapidly increasing human population. b. the greenhouse effect. c. air pollution. d. lack of water. Air pollution a. corrodes buildings. b. causes various human diseases. c. damages plants. d. does all of the above. Air pollution may cause a. lung cancer. b. emphysema. c. bronchitis. d. all of the above. Which acid is a severe air pollutant? a. carbonic acid b. nitric acid c. hydrofluoric acid d. hydrochloric acid The two chemical elements associated with acid deposition are a. nitrogen and oxygen. b. sulfur and oxygen. c. nitrogen and sulfur. d. carbon and oxygen. Which of the following is the most reliable source of energy for the next few hundred or thousands of years? a. oil b. coal c. sun d. natural gas
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