Monday, March 3rd 2008, 1:35 PM EST
Water vapour constitutes Earth's most significant greenhouse gas, accounting for about 95% of Earth's greenhouse effect (4). Many "facts and figures' regarding global warming ignore the powerful effects of water vapour in the greenhouse system, is this missing factor deliberate? the human impact can often be exaggerated as much as 20-fold.
Water vapour is 99.999% of natural origin. Other atmospheric greenhouse gases, carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), and miscellaneous other gases (CFC's, etc.), are also mostly of natural origin (except for the latter, which is mostly anthropogenic).
Humans may contribute slightly to greenhouse gas concentrations through farming, manufacturing, power generation, and transportation. Those emissions are dwarfed in comparison to emissions from natural sources, even the most costly efforts to limit human emissions would have a very small-- perhaps undetectable-- effect on global climate.
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Climate by Zbigniew Jaworowski, M.D., Ph.D., D.Sc., 21st Century Science and Technology
This FAQ was last updated on:
Monday, March 3rd 2008, 2:18 PM EST