What was the approximate percent increase in oil use from 1986 through 1997?
A. 10%
B. 20%
C. 30%
D. 40%
E. 50%
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The data in the graph can be useful in explaining the greenhouse effect when they are compared with
A. volcanic activity.
B. sunspot activity.
C. mean global temperature.
D. annual nitrous oxide.
E. cycles of flooding and drought.
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43534
A. 4
B. 5
C. 6
D. 6
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