You deny that CO2 traps radiation? Where's the extra gas above historical averages coming from , if not from man, considering that we emit more in a day than all the volcanoes on earth do in a year?
0.04% of atmospheric composition. Of which we produce 0.06% of it. Yeah, it's a threat.
I found it interesting when recently I learned that professional greenhouses pump up their CO2 content to bout 1400ppm. The plants love it and not a single worker has experienced ill effects. what're we predicted to get up to in our most fevered imagination? 360? 420? Oh noes! We're all gonna .... oh wait.. no we're not.
How's that water vapor problem coming along? About 4% total atmospheric composition with a far higher green house gas effects. Have we been able to stop the damage it's doing to the environment?
Well Fritz, this has been explained to you before. But here we go again. By the way, if you are a schoolteacher, I am damned glad that I never had such an incompetant teacher.
Water vapor is the most powerful greenhouse gas
Water vapor is the most powerful greenhouse gas
"Water vapour is the most important greenhouse gas. If you get a fall evening and the sky is clear, heat will escape, the temperature will drop. If there's cloud cover, the heat is trapped by water vapour and the temperature stays warm. If you go to In Salah in southern Algeria, they recorded at noon 52°C. By midnight, it's -3.6°C. It's caused because there is very little water vapour in the atmosphere and is a demonstration of water vapour as the most important greenhouse gas." (Tim Ball)
What the science says...
Water vapour is the most dominant greenhouse gas. Water vapour is also the dominant positive feedback in our climate system and amplifies any warming caused by changes in atmospheric CO2. This positive feedback is why climate is so sensitive to CO2 warming.
Water vapour is the most dominant greenhouse gas. The greenhouse effect or radiative flux for water is around 75 W/m2 while carbon dioxide contributes 32 W/m2 (Kiehl 1997). These proportions are confirmed by measurements of infrared radiation returning to the Earth's surface (Evans 2006). Water vapour is also the dominant positive feedback in our climate system and a major reason why temperature is so sensitive to changes in CO2.
Unlike external forcings such as CO2 which can be added to the atmosphere, the level of water vapour in the atmosphere is a function of temperature. Water vapour is brought into the atmosphere via evaporation - the rate depends on the temperature of the ocean and air, being governed by the Clausius-Clapeyron relation. If extra water is added to the atmosphere, it condenses and falls as rain or snow within a week or two. Similarly, if somehow moisture was sucked out of the atmosphere, evaporation would restore water vapour levels to 'normal levels' in short time.