2015-12-16. Plankton Reveal New Secrets About Ancient CO2 Levels.

posted Dec 18, 2015, 8:33 PM by Alan Gould
By Natalie Jacewicz, EoS Earth and Space Science News, AGU. For GSS Life and Climate chapter 10. Excerpt: An analysis of phytoplankton shells doubles previous estimates of the amount of carbon dioxide in the atmosphere 11 million years ago. ...Scientists studying past global temperatures and carbon dioxide (CO2) levels have struggled to explain a global cooling that occurred between 11 and 6 million years ago. Generally, such drops correspond with plummeting CO2, but previous measurements have found only a modest decrease in the greenhouse gas during the period. New research, however, has revealed a CO2 plunge that scientists have never before detected, and the clue lies in tiny ocean plankton....  https://eos.org/articles/plankton-reveal-new-secrets-about-ancient-co2-levels
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