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So, greenhouse is all about carbon dioxide, right?
Wrong. The most important players on the greenhouse stage are water vapor and clouds. Carbon dioxide has been increased to about 0.038% of the atmosphere (possibly from about 0.028% pre-Industrial Revolution) while water in its various forms ranges from 0% to 4% of the atmosphere and its properties vary by what form it is in and even at what altitude it is found in the atmosphere. In simple terms the bulk of Earth's greenhouse effect is due to water vapor by virtue of its abundance. Water accounts for about 90% of the Earth's greenhouse effect -- perhaps 70% is due to water vapor and about 20% due to clouds (mostly water droplets), some estimates put water as high as 95% of Earth's total tropospheric greenhouse effect (e.g., Freidenreich and Ramaswamy, ?Solar Radiation Absorption by Carbon Dioxide, Overlap with Water, and a Parameterization for General Circulation Models,? Journal of Geophysical Research 98 (1993):7255-7264). The remaining portion comes from carbon dioxide, nitrous oxide, methane, ozone and miscellaneous other "minor greenhouse gases." As an example of the relative importance of water it should be noted that changes in the relative humidity on the order of 1.3-4% are equivalent to the effect of doubling CO2. So I am not very smart and so what does all this above mean to me a person who thought global warming was caused by C02? BTW, I am not that stupid. C02 as a molecular molecule may last for some time but its effect on GW is not accummulative therefore one of the answers was totally inaccurate below. C02 also has a molecule weight heavier than air and oxygen so what happens in a gravity type of scenario, it falls out of the atmosphere to where the plants use it. I dare any scientist to find C02 above the 10,000 foot level as it probably is not there in normal type of weather conditions. What you have here is a situation uncommon in science where the answer or conclusion is already given, MAN causes global warming and now you have these scientists scurring around to prove it. The scientific process is just the opposite where observations and fact preclude theories and hypothesis. Gore has everyone believing in this myth long before facts were developed. What is this called, it is called social engineering by the master himself, the man who invented the internet, Al Gore.

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