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<blockquote data-quote="zubenelgenubi" data-source="post: 5342641" data-attributes="member: 63706"><p>No, It's not. Unlike a worthwhile temperature record, scientists can determine what past CO2 concentrations have been. They have been 10 to 15 times higher, life did not end. Some theorize that high CO2 concentrations led to the premcambrian explosion, not mass extinction.</p></blockquote><p></p>
[QUOTE="zubenelgenubi, post: 5342641, member: 63706"] No, It's not. Unlike a worthwhile temperature record, scientists can determine what past CO2 concentrations have been. They have been 10 to 15 times higher, life did not end. Some theorize that high CO2 concentrations led to the premcambrian explosion, not mass extinction. [/QUOTE]
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