Read the excerpt from "Climate Change: An Overview.”By the early twentieth century, carbon emissions from fossil-fuel burning reached 1 billion tons a year. Automobiles, airplanes, and domestic and agricultural energy demands all contributed to the rising trend. In the 1950s, scientists used a new generation of equipment to confirm that carbon-dioxide concentrations were doubling and that this would have the effect of increased temperatures.
Answer
A
long-term effect of increasing carbon emissions.
B
long-term effect of decreasing temperatures.
C
short-term effect of decreasing the use of new technology.
D
short-term effect of increasing energy demands.
Explanation
The excerpt says fossil-fuel emissions were rising and scientists confirmed that carbon-dioxide concentrations were doubling. It also says this would lead to increased temperatures, a long-term effect of increasing carbon emissions. So the best answer is “long-term effect of increasing carbon emissions.”
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