[Blueflag]

Land fills, refineries (and similar) and the bowels of cud-chewing domesticated livestock are the three largest 'man-made' sources of methane.

[Candor7]

You forgot to mention Taco eating Mexican illegals, the greatest source of Urban Methane in the USA. The lock is broken, and the desertification of Urban American could begin as early as next year.

First our Urban centers will dry up as a result of a collapsing economy due to crime, as our giant institutions which preserve the American lifestyle of individual freedoms based on responsibility of each of us, come crashing down.

The rule of law shall end and the precincts of our large cities will have no more cars, only braying donkeys that sidle back and forth aimlessly while their owners do weed in the shadows of a society of freedom long forgotten!We need a totalitarian state right NOW!

[palmer]

Don't forget to look at methane sinks. It tends to break down quickly (and warming, manmade or not, increases the rate of break down). My major point about forests still holds, if you want global cooling it is better to burn them.