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Last Time Carbon Dioxide Levels Were This High: 15 Million Years Ago, Scientists Report
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| Contributor | RP |
| Last Edited | RP Oct 09, 2009 03:49pm |
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| Category | Report |
| News Date | Friday, October 9, 2009 09:00:00 PM UTC0:0 |
| Description | You would have to go back at least 15 million years to find carbon dioxide levels on Earth as high as they are today, a UCLA scientist and colleagues report Oct. 8 in the online edition of the journal Science.
"The last time carbon dioxide levels were apparently as high as they are today — and were sustained at those levels — global temperatures were 5 to 10 degrees Fahrenheit higher than they are today, the sea level was approximately 75 to 120 feet higher than today, there was no permanent sea ice cap in the Arctic and very little ice on Antarctica and Greenland," said the paper's lead author, Aradhna Tripati, a UCLA assistant professor in the department of Earth and space sciences and the department of atmospheric and oceanic sciences.
Tripati's new chemical technique has an average uncertainty rate of only 14 parts per million.
"We can now have confidence in making statements about how carbon dioxide has varied throughout history," Tripati said. |
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