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To: koan who wrote (15006)	7/3/2006 2:03:56 AM
From: E. Charters	Read Replies (1) \| Respond to of 78419

I am not sure this is correct ... It is indeed true that human emissions of CO2 are a small percentage of the total carbon cycled through the different components of the Earth system: plants, soils, rocks, the oceans, and the air. But these human emissions are by no means insignificant. For the last 420,000 years, until the beginning of the industrial revolution (~1750), this cycle of carbon exchange was in a quasi-stable equilibrium, i.e., the continual release and uptake of carbon kept CO2 concentration in the Earth's atmosphere fluctuating between 180 ppm (parts per million) and 280 ppm. Since 1750, the atmospheric concentration of carbon dioxide has increased by 31%, to a present level of 367 ppm. This increase in the CO2 concentration of the atmosphere is mainly due to the burning of fossil fuels and large-scale deforestation and land-use change. These human activities have forced the carbon cycle out of the state of equilibrium and out of the known range of variation. ************************** The government cites "2,500 scientists" who supposedly endorse the U.N.’s 1996 Intergovernmental Panel on Climate Change report. Some scientists are calling this into question. It seems that while the work of about 2,100 scientists contributed to or reviewed the report, most were not atmospheric specialists or expert on atmospheric physics. Indeed, only about 80 scientists were the authors of the report’s 11 chapters, and an even smaller number were involved in writing the Policymaker’s Summary. On the other hand, about 100 climate scientists signed the Leipzig Declaration in 1996, indicating that they doubted the validity of the computer models used to predict global warming. The following items of interest were quoted in the August 1997 edition of Environment News: * A Gallup Poll found that only 17 percent of the members of the Meteorological Society and the American Geophysical Society think that the slight warming experienced in the 20th century has been the result of man-made greenhouse gas emissions – principally CO2 from burning fossil fuels. * Only 13 percent of the scientists responding to a recent survey conducted by Greenpeace believe catastrophic climate change will result from continuing current patterns of energy use. In the December 4, 1997 Wall Street Journal, Arthur B. Robinson and Zachary W. Robinson said that the global warming hypothesis is no longer tenable, in spite of observations of increased atmospheric CO2 in the 20th century. Atmospheric temperature measurements in the last 50 years have "definitively shown that major greenhouse warming of the atmosphere is not occurring, and is unlikely ever to occur." Temperatures have been rising over the last 300 years, since the "Little Ice Age", but have not yet reached the 3,000 year average. They point to increased solar activity over the last 250 years as the cause of the increase in temperature. In addition, they point out that mean temperatures have actually shown a slight decline in the last 20 years. *************************************** The real main cause of fluctuations in carbon dioxide levels. publicaffairs.noaa.gov