Coupling of CO 2 and Ice Sheet Stability Over Major Climate Transitions of the Last 20 Million Years

550 13. Climate action 15. Life on land 01 natural sciences 0105 earth and related environmental sciences
DOI: 10.1126/science.1178296 Publication Date: 2009-10-09T02:08:01Z
ABSTRACT
CO 2 and Miocene Climate Change Atmospheric carbon dioxide is a powerful greenhouse gas believed to be one of the most important determinants of climate. Ice cores provide a detailed and direct record of CO 2 concentrations over the past 800,000 years, but not earlier. Tripati et al. (p. 1394 , published online 8 October) report B/Ca measurements of planktonic foraminifera, from which they can infer atmospheric CO 2 concentrations, for the past 20 million years. The concentration of atmospheric CO 2 was similar to preindustrial values for the past 10 millions years, but between 15 and 20 million years ago, during the warm lower Miocene epoch, CO 2 was more abundant, and major climate transitions toward cooler conditions occurred when CO 2 decreased substantially.
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