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Global Warming Might be Incorrect
The study found that climate models explain only about half of the heating that occurred during a well-documented period of rapid global warming in Earth's ancient past.
It contains an analysis of published records from a period of rapid climatic warming about 55 million years ago known as the Palaeocene-Eocene thermal maximum, or PETM.
"In a nutshell, theoretical models cannot explain what we observe in the geological record," said oceanographer Gerald Dickens, a co-author of the study and professor of Earth science at Rice University.
"There appears to be something fundamentally wrong with the way temperature and carbon are linked in climate models," he added.
During the PETM, for reasons that are still unknown, the amount of carbon in Earth's atmosphere rose rapidly.
For this reason, the PETM, which has been identified in hundreds of sediment core samples worldwide, is probably the best ancient climate analogue for present-day Earth.
In addition to rapidly rising levels of atmospheric carbon, global surface temperatures rose dramatically during the PETM.
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