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Last time carbon dioxide levels were this high: 15 million years ago, scientists report http://apocadocs.com/s.pl?1255094723
"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.... Levels of carbon dioxide have varied only between 180 and 300 parts per million over the last 800,000 years -- until recent decades, said Tripati, who is also a member of UCLA's Institute of Geophysics and Planetary Physics. 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.
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[Read more stories about:
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