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Politics : Formerly About Advanced Micro Devices -- Ignore unavailable to you. Want to Upgrade?

To: Taro who wrote (313719)	12/7/2006 3:28:05 AM
From: tejek	Respond to of 1572561

For thousands of years prior to 1750, atmospheric CO2 ranged between 200-300 parts per million volume. A link to that, please. The most direct method for measuring atmospheric carbon dioxide concentrations for periods before direct sampling is to measure bubbles of air (fluid or gas inclusions) trapped in the Antarctic or Greenland ice caps. The most widely accepted of such studies come from a variety of Antarctic cores and indicate that atmospheric CO2 levels were about 260–280µL/L immediately before industrial emissions began and did not vary much from this level during the preceding 10,000 years. en.wikipedia.org