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A comment on Temperature chart for the last 11,000 years. Parent comment

Re:Temperature chart for the last 11,000 years by danmaz74 on Saturday September 21, 2013 @10:52AM (#6423112)
AFAIK one of the main ways to reconstruct CO2 concentration is to study samples of air trapped inside old ice. This looks like a pretty direct and reliable method to me.
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