What do you think happens to the methane in the atmosphere?  It doesn&#x27;t vanish.  Most of it reacts in the statosphere and troposphere and oxidizes into ... you guessed it:  Carbon Dioxide.<p>10% gets eaten by organisms in the soil, but at least 90% turns into CO2.<p>Of course, Natural Gas thermal combined-cycle electricity generation is MUCH more efficient than Coal, no matter which way you look at it.  (Unless you have an old already-paid-for coal plant next to a coal mine and only care about dollars)