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. This excerpt primarily describes the
Answer
A
long-term effect of increasing carbon emissions.
B
short-term effect of decreasing the use of new technology.
C
short-term effect of increasing energy demands.
D
long-term effect of decreasing temperatures.
Explanation
The excerpt says carbon emissions rose over time and that scientists confirmed carbon-dioxide concentrations were doubling. It also links this increase to higher temperatures, which is a long-term effect of increasing carbon emissions. The passage does not describe decreasing temperatures or reduced technology use.
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