The Monroe Power Plant in Monroe, Michigan, consists of four generating units built in the early 1970s. The plant is a large source of emissions of carbon dioxide, a heat-trapping gas that accumulates in the atmosphere. According to federal data, it produced 19.4 million tons of carbon dioxide in 2008, the ninth largest amount among U.S. power plants. (Renee Schoof/MCT)
The Monroe Power Plant in Monroe, Michigan, consists of four generating units built in the early 1970s. The plant is a large source of emissions of carbon dioxide, a heat-trapping gas that accumulates in the atmosphere. According to federal data, it produced 19.4 million tons of carbon dioxide in 2008, the ninth largest amount among U.S. power plants. (Renee Schoof/MCT) Renee Schoof / MCT
The Monroe Power Plant in Monroe, Michigan, consists of four generating units built in the early 1970s. The plant is a large source of emissions of carbon dioxide, a heat-trapping gas that accumulates in the atmosphere. According to federal data, it produced 19.4 million tons of carbon dioxide in 2008, the ninth largest amount among U.S. power plants. (Renee Schoof/MCT) Renee Schoof / MCT

Environmentalists question coal's place in Obama policy

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