Eh? The paper shows NG equivalent CO2 emissions (1100 lbs/MWh) still has nearly half that of coal (2100 lbs/MWh) considering life cycles, and is vastly better than coal in SOx and NOx emissions. Even liquefied gas is not 'much worse' than coal per this paper and even if it was, so what? LNG is less than 2% of the mix and falling (~27TCF gas total US, 0.5 TCF liquefied ). Also, I see methane concentration in the atmosphere has been flat in the atmosphere for the last ~10 years.