17. The primary purpose of the passage is to
warn of the dangers of continued burning of fossil fuels
discuss the significance of increasing the amount of carbon dioxide in the atmosphere
explain how a constant temperature is maintained on the Earth s surface
describe the ways in which various atmospheric and climatic conditions contribute to the Earth s weather
demonstrate the usefulness of mathematical models in predicting long-range climatic change
18. According to the passage, the greatest part of the solar energy that reaches the Earth is
concentrated in the infrared spectrum
concentrated at visible wavelengths
absorbed by carbon dioxide molecules
absorbed by atmospheric water vapor
reflected back to space by snow and ice
19. According to the passage, atmospheric carbon dioxide performs all of the following functions EXCEPT:
absorbing radiation at visible wavelengths
absorbing infrared radiation
absorbing outgoing radiation from the Earth
helping to retain heat near the Earth s surface
helping to maintain a constant average temperature on the Earth s surface
20. Which of the following best describes the author s attitude toward the increasing amount of carbon dioxide in the atmosphere and its consequences?
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