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News From the Field

Absence of Clouds Caused Prehuman Super-greenhouse Periods

April 10, 2008

earth and environment graphic 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. Full Story

Penn State

The National Science Foundation (NSF) is an independent federal agency that supports fundamental research and education across all fields of science and engineering. In fiscal year (FY) 2016, its budget is $7.5 billion. NSF funds reach all 50 states through grants to nearly 2,000 colleges, universities and other institutions. Each year, NSF receives more than 48,000 competitive proposals for funding and makes about 12,000 new funding awards. NSF also awards about $626 million in professional and service contracts yearly.

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