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How do scientists know the CO2 levels going back over 400,000 years?

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Answer: Various proxy measurements have been used to attempt to determine atmospheric carbon dioxide concentrations millions of years in the past. These include boron and carbon isotope ratios in certain types of marine sediments, and the number of stomata observed on fossil plant leaves. 2 record of over 500 million years.

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Vella Stamm
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answered 6 months ago