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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Anthropogenic Climate Change »Anthropogenic Climate Change
Is the Earth's climate changing? »Is the Earth's climate changing?
Sensitivity of Earth's climate to atmospheric CO2? »Sensitivity of Earth's climate to atmospheric CO2?
How can climatic sensitivity to atmospheric CO2 be estimated? »How can climatic sensitivity to atmospheric CO2 be estimated?
20 million year record of CO2 levels preserved in foraminifera
Foraminifera shells indicate historic acidity of surface water »Foraminifera shells indicate historic acidity of surface water
Surface water acidity rises as atmospheric CO2 rises »Surface water acidity rises as atmospheric CO2 rises
100-200 ppm CO2 changes associated with major climate transitions »100-200 ppm CO2 changes associated with major climate transitions
CO2 levels haven't risen this rapidly at any time over 20m years »CO2 levels haven't risen this rapidly at any time over 20m years
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