Here is an article which debunks your 98% argument. Maybe its right, maybe its wrong. But I like the fact that it does not throw out some superficial made up statistic. The idea that an issue this complicated can be so simply resolved is sophomoric and egotistical. Nobody really knows water vapor’s precise effect—thus the author’s itntellectual honesty. Your desire for a precise measurement demonstrates that you can’t grasp the concept that we just don’t know yet. That’s really kind of sad. I don’t think you would be a good scientist.
http://web.archive.org/web/20070624015308/http://www.realclimate.org/index.php?p=142
BWWWWWHAAAAAAA!!
Or to quote R. Heinlein: "He was the kind who'd hit himself in the head with a hammer, because it felt so good when it was over."
Unbelievable?
..believe it. :o)