26. According to the passage, what does the author imply about the nature of carbon dioxide?
A. Carbon dioxide trapped in the Earth's atmosphere does not cause the greenhouse effect.
B. Carbon dioxide will not be harmful unless people produce far too much of it.
C. Carbon dioxide is necessary because it normally helps heat easily escape from the
Earth's atmosphere.
D. Carbon dioxide makes the average surface temperature on Earth rise from 0 degrees
Fahrenheit to 59 degrees Fahrenheit
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