Whereas pure methane is lighter than air, methane loaded with water droplets is much heavier, and thus spreads over the land, mixing with air in the process (and losing water as rain).
What the hell does this mean? 'Methane loaded with water droplets is heavier than air.' What?! A cloud is 'air loaded with water droplets'; for some reason this 'loaded air' still seems to float mostly quite high up. The presence of water droplets in the gas mixture might change the way that an air (or methane) parcel moves in the atmosphere (because the latent heat of the water changes the thermodynamical situation), but it has nothing to do with the weight of the droplets. If the droplets are heavy and the methane is light, the drops go down and the gas goes up. Water droplets will never, ever, 'drag' some gas with them because of their weight.
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