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What is the reason for the trend in sulfur dioxide emissions illustrated in the graph below?
"Sulfur Dioxide." Sulfur Dioxide. Environmental Protection Agency (EPA), n.d. Web. 09 Apr. 2016.
Decrease in use of coal for electricity generation.
Decrease in use of petroleum for transportation.
Increase in renewable energy sources for electricity production.
Introduction of Cap and Trade legislation for sulfur dioxide emissions.
Increase in nuclear energy electricity production.