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Kevin
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Joined: 13 Apr 2004
Posts: 1349
Location: Eugene, Oregon
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 Posted: Sun Oct 18, 2009 8:55 am Post subject: CO2 levels haven't been this high for 15 million years... |
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From the AW blog center...
http://www.ArchitectureWeek.com/blogs/link.php?id=45417
"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."
| Science wrote: | “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.
“Carbon dioxide is a potent greenhouse gas, and geological observations that we now have for the last 20 million years lend strong support to the idea that carbon dioxide is an important agent for driving climate change throughout Earth’s history,” she said. |
"Yes, pumping more and more CO2 into the air is a very bad idea, as this news release from UCLA on a major new study makes clear. The study itself, “Coupling of CO2 and Ice Sheet Stability Over Major Climate Transitions of the Last 20 Million Years,” (subs. req’d) was released by Science earlier this month."
"...It has been known that modern-day levels of carbon dioxide are unprecedented over the last 800,000 years, but the finding that modern levels have not been reached in the last 15 million years is new...."
referenced news release:
http://www.newsroom.ucla.edu/portal/ucla/last-time-carbon-dioxide-levels-111074.aspx |
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