Water vapour was responsible for 95 per cent of the greenhouse effect....
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.
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.
There you go. Anthropogenic global warming is 0.279% of the total warming.
If a forcing of 0.279% is enough to ruin the ecosystem, it's not stable anyway.
So screw it.