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Old 07-29-2010, 11:20 AM   #1
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Default Ancient Ocean Acidification Intimates Long Recovery from Climate Change

Ancient Ocean Acidification Intimates Long Recovery from Climate Change
July 22, 2010
By David Biello

Ancient Ocean Acidification Intimates Long Recovery from Climate Change: Scientific American
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Of course the present era is hardly the first time the planet has seen higher levels of CO2. In fact, roughly 121 million years ago—during an age known as the early Aptian—global CO2 levels were likely higher than 800 ppm (and possibly as high as 2,000 ppm) thanks to cataclysmic volcanic eruptions. Now new research published in Science July 23 shows how ancestors of today's nannoplankton fared in those acidic oceans of long ago.

It was a time of "severe global warming," paleobiologist Elisabetta Erba of the University of Milan and her colleagues wrote, after studying the carbon isotopes embedded in deep seabed cores drilled in the Pacific Ocean and locations in the ancient Tethys Ocean, which existed during the Mesozoic era. The records reveal that...
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