Isn't that the point
If you're a non-believer in global warming (I thought there was enough evidence to convince everyone by now though), you wouldn't care about the methane etc. so you could dump it all in some remote locations of the world (nowhere near water courses etc). We just have difficulty with that concept because europe is so crowded.
Heh, or dump it all on the moon, although that was done with radioactive waste in space 1999 and we know how badly that went