And if people want to say foolish things, without doing even a modicum of research, like a cursory Google search, before spouting foolish nonsense, then they'll be made to look foolish by their own words, as Mr. Lincoln suggested.
If you want to console him for saying foolish things, then be my guest....you've already seemingly appointed yourself his knight in shining armor.
I am nobody's knight in shining armour however while perhaps suggesting that cows farting causes global warming might be an oversimplification it is none the less not all that hard to google "agricultural contribution to greenhouse gases" and see that for example much of the methane in your graph is probably from methane released from agriculture.
A decent article on the subject...http://blogs.das.psu...in-perspective/
How much of that "decay of biomass" and "methane" in your graph is from ruminant agriculture? I would guess a large portion.
It's one thing to act high and mighty but to call out something that is actually correct only makes one person look the fool....