Another study, covering the past 20 million years, estimated Pliocene atmospheric CO 2 levels at no more than 325 ppmv (or at most 350 ppmv when data points just outside the Pliocene epoch are ...
Paleoclimate scientists are trying to understand the causes of the ~90 parts per million (ppmv) atmospheric CO 2 swings between glacial and interglacial climates. Even though these cycles between cold ...
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