| http://www.w3.org/ns/prov#value | - However, generating electricity from coal is responsible for approximately 2/3 of the U.S.'s sulfur dioxide (SO2) emissions (which contribute to air pollution problems such as fine particle pollution, acid rain, and regional haze), 1/5 of the nitrogen oxides (NOx) emissions (which contribute to ozone pollution as well as the problems listed above), over 1/3 of our mercury air emissions, and has po
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