Somehow in all the furor, I think this simple fact has been lost; that combining carbon and oxygen results in CO (incomplete combustion) and/or CO2 (complete combustion).
The environmentalists have so confused the landscape by not discriminating between sulfur, oxides of sulfur, oxides of nitrogen, the freons, water vapor, and CO2 that I honestly doubt that more than a figurative handful of Americans understand the simple fact you've stated.
Methane, CH4, is the predominant constituent of natural gas. Complete combustion yields carbon dioxide and water (plus the nitrogen in the combustion air).