Yale Environment 360: The dramatic increase in using natural gas to produce electricity in the United States has led to an equally dramatic decline in the amount of pollutants and carbon dioxide emitted from the nations power plants, according to a new study. The study, conducted by researchers at the National Oceanic and Atmospheric Administration, showed that the switch from coal-fired to natural gas-fired power plants has reduced CO2 emissions by 23 percent and emissions of nitrogen oxides and sulfur dioxide by 40...