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Ice bubbles reveal biggest rise in CO2 for 800,000 years
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| Contributor | RP |
| Last Edited | RP Sep 05, 2006 06:36pm |
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| Category | Study |
| News Date | Wednesday, September 6, 2006 12:00:00 AM UTC0:0 |
| Description | The rapid rise in greenhouse gases over the past century is unprecedented in at least 800,000 years, according to a study of the oldest Antarctic ice core which highlights the reality of climate change.
Air bubbles trapped in ice for hundreds of thousands of years have revealed that humans are changing the composition of the atmosphere in a manner that has no known natural parallel.
Scientists at the British Antarctic Survey (BAS) in Cambridge have found there have been eight cycles of atmospheric change in the past 800,000 years when carbon dioxide and methane have risen to peak levels.
Each time, the world also experienced the relatively high temperatures associated with warm, inter-glacial periods, which were almost certainly linked with levels of carbon dioxide and possibly methane in the atmosphere.
However, existing levels of carbon dioxide and methane are far higher than anything seen during these earlier warm periods, said Eric Wolff of the BAS. |
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