| wilbert |
05-09-2009 11:59 PM |
Quote:
Originally Posted by ArcticStones
(Post 532190)
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That’s right. Massive amounts of CO2 and other climate gases are harmful.
Prior to the Industrial Revolution, atmospheric CO2 levels were roughly 280 ppm (parts per million). Today the level is 394 ppm, and rising at about 3 ppm per year.
There is strong consensus amongst climate experts that drastic feedback processes are extremely likely to occur should atmospheric CO2 concentrations approach 500 ppm. What is feared is that the ongoing climate change will become catastrophic and, from the perspective of our human timeline, irreversible.
For these good reasons CO2 is rightly viewed as a pollutant -- mind you, in massive amounts, and in concentrations that upset the natural balances of the ecosystems of the planet on which we live.
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Carbon dioxide levels have indeed changed for various reasons, human and otherwise, just as they have throughout geologic time. Since the beginning of the industrial revolution, the CO2 content of the atmosphere has increased. The RATE of growth during this period has also increased from about 0.2% per year to the present rate of about 0.4% per year,which growth rate has now been constant for the past 25 years. Greenhouse gases form about 3 % of the atmosphere by volume. They consist of varying amounts, (about 97%) of water vapour and clouds, with the remainder being gases like CO2, CH4, Ozone and N2O, of which carbon dioxide is the largest amount. Hence, CO2 constitutes about 0.037% of the atmosphere and .018% is attributed to humans. CO2 is not a pollutant never was. The 500PPM is a Computer model data it is not reality.CO2 is a natural part of Earth's Atmosphere CO2 levels in the atmosphere have risen from 0.028% to 0.038% (380ppm) over the past 100 years (IPCC)
Carbon Dioxide (CO2) is not toxic until 5% (50,000ppm)concentration and ( only because the respiratory center of the brain become sensitive to CO2 instead of O2)
Any detrimental effects of Carbon Dioxide (CO2) including chronic exposure to 3% (30,000ppm) are reversible without any ill effects. If someone could check out the CO2 content in a room full of people one would see that a reading of 1000ppm to 1200ppm is very common depending how big is the crowd. OSHA, NIOSH, and ACGIH occupational exposure standards are 0.5% (5,000 ppm) Carbon Dioxide.The Vostok Ice cores show CO2 to fellow as temperature rise .. hence a result not a cause.
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