Compared to coal, natural gas produces approximately half of the carbon emissions per unit of electricity generated. (ucsusa.org)
Burning natural gas to generate electricity results in only half the CO2 emissions per unit of electricity generated and generates much lower conventional pollutants as well. (carlineconomics.com)
In a fossil fuel - fired generator, this means less carbon dioxide emissions for the same unit of electricity produced. (scientificamerican.com)