EPA – «Natural Gas» > Air Emissions: «At the power plant, the burning of natural gas produces nitrogen oxides and carbon dioxide, but in lower quantities than burning coal or oil.».
Se det amerikanske miljøverndepartementets tall for utslipp fra kraftverk som fyrer med henholdsvis naturgass, olje og kull under avsnittene «Environmental impacts».
IFEUArkivert 12. oktober 2015 hos Wayback Machine. – studie av moderne kullkraftverk i Hamburg-Moorburg, som slipper ut tre ganger mer CO2 per energienhet produsert, sammenliknet med et moderne gasskraftverk. Side 3-4.
Natural Gas Supply Association – «Natural Gas and the Environment»Arkivert 3. mai 2009 hos Wayback Machine.: «Natural gas is the cleanest of all the fossil fuels. Composed primarily of methane, the main products of the combustion of natural gas are carbon dioxide and water vapor, the same compounds we exhale when we breathe. Coal and oil are composed of much more complex molecules, with a higher carbon ratio and higher nitrogen and sulfur contents. This means that when combusted, coal and oil release higher levels of harmful emissions, including a higher ratio of carbon emissions, nitrogen oxides (NOx), and sulfur dioxide (SO2).»
Thompson, Linda. «Vitrification of Nuclear Waste». PH240 - Fall 2010: Introduction to the Physics of Energy. Stanford University. Besøkt 9. september 2014.
EPPO – «Oil industry conversions», tabellen «Calorific value of fuels» omtrent midt på siden, og spesielt tabellen «Energy values» litt nedenfor midten.
Natural Gas Supply Association – «Natural Gas and the Environment»Arkivert 3. mai 2009 hos Wayback Machine.: «Natural gas is the cleanest of all the fossil fuels. Composed primarily of methane, the main products of the combustion of natural gas are carbon dioxide and water vapor, the same compounds we exhale when we breathe. Coal and oil are composed of much more complex molecules, with a higher carbon ratio and higher nitrogen and sulfur contents. This means that when combusted, coal and oil release higher levels of harmful emissions, including a higher ratio of carbon emissions, nitrogen oxides (NOx), and sulfur dioxide (SO2).»
IFEUArkivert 12. oktober 2015 hos Wayback Machine. – studie av moderne kullkraftverk i Hamburg-Moorburg, som slipper ut tre ganger mer CO2 per energienhet produsert, sammenliknet med et moderne gasskraftverk. Side 3-4.
