News From the Field
Absence of Clouds Caused Prehuman Super-greenhouse Periods
April 10, 2008
In a world without human-produced pollution, biological productivity controls cloud formation and may be the lever that caused super-greenhouse episodes during the Cetaceous and Eocene, according to Penn State paleoclimatologists. In general, the proxies indicate that the Cretaceious and Eocene atmosphere never exceeded four times the current carbon dioxide level, which is not enough for the models to create super-greenhouse conditions.
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