There is an excellent new guide for doubters of anthroponic warming at NewScientist. Meanwhile, Augie Auer, some meteorologist in New Zealand spouts some nonsense “debunking global warming“. So let’s put the guide to the test. Sorry for not quoting the full answers, but just giving the links: usually, writing nonsense is quick, but debunking it can be quite complex, so I would have to quote long paragraphs. And the guide also has nice graphics.
Water vapour was responsible for 95 per cent of the greenhouse effect, an effect which was vital to keep the world warm, he explained.
“If we didn’t have the greenhouse effect the planet would be at minus 18 deg C but because we do have the greenhouse effect it is plus 15 deg C, all the time.”
The other greenhouse gases: carbon dioxide, methane, nitrogen dioxide, and various others including CFCs, contributed only five per cent of the effect, carbon dioxide being by far the greatest contributor at 3.6 per cent.
See “Climate myths: CO2 isn’t the most important greenhouse gas“. I have seen these “95%” before, but I have no idea what mathematical acrobatics have to be used to get that number.
However, carbon dioxide as a result of man’s activities was only 3.2 per cent of that, hence only 0.12 per cent of the greenhouse gases in total. Human-related methane, nitrogen dioxide and CFCs etc made similarly minuscule contributions to the effect: 0.066, 0.047 and 0.046 per cent respectively.
Easy, isn’t it? The same excercise can also be done with the “How to Talk to a Climate Skeptic” Guide.