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20 million year record of CO2 levels preserved in foraminifera

Atmospheric concentrations of CO2 stretching back 20 million years can be estimated via analysis of the the shells of tiny creatures known as foraminifera buried in a column of ocean mud and rock.

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20 million year record of CO2 levels preserved in foraminifera
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Foraminifera shells indicate historic acidity of surface water
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Surface water acidity rises as atmospheric CO2 rises
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100-200 ppm CO2 changes associated with major climate transitions
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CO2 levels haven't risen this rapidly at any time over 20m years
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400,000-year record of climatic transitions in a Chinese stalagmite
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