In 1970, the U.S. passed the Clean Air Act which limited emissions from stationary (industrial) sources, including coal-burning power plants. Why has this law not been as successful as hoped in reducing air pollution?
A. The older coal-burning and industrial plants were not required to comply with the law.
B. Coal-burning plants built after 1970 were not required to comply with the law.
C. The U.S. started importing coal from China which produces more emissions.
D. Emissions from coal-burning plants in Iceland have offset our reductions.
Answer: A
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