The suspicion was confirmed when he said "Has anyone asked them if they know how carbon dioxide ( a trace gas, the total amount of which comprises a tiny amount contributed by us ) stacks up against water vapour?".
It's simply not possible to be as stupid as Gunge is pretending to be (unless, of course, you are called Donald Trump -- there is an exception to every rule), therefore he is pretending. QED.
Come on now, Gunge, it's time to admit it - you're really an anti-climate-change activist, aren't you?