| The fact is, there has been global warming, but the contribution of human-generated carbon dioxide is necessarily so minuscule as to be nearly undetectable. Here's why: Carbon dioxide, considered the main vector for human-caused global warming, is some 0.038 per cent of the atmosphere [1] a trace gas. Water vapour varies from 0 per cent to four per cent [2], and should easily average one per cent or more [3] near the Earth's surface, where the greenhouse effect would be most important, and is about three times more effective [4] a greenhouse gas than carbon dioxide.
So water vapour is at least 25 times more prevalent and three times more effective; that makes it at least 75 times more important to the greenhouse effect than carbon dioxide [5]. The total contribution of carbon dioxide to the greenhouse effect is therefore 0.013 or less...............................................Full Article: Source
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