Originally posted by Starving Steve
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Finally, for the children here who might be reading this, an increase in CO2 to 0.05% from 0.035% in 1940 does represent a large percentage increase (43%). But the significance is near zero--- just as having a penny in your pocket and finding another penny on the ground would add 100% to your pocket change. (In percentage terms, you have done well indeed, but your actual gain is just one cent.)
The Ordovician Period is the second period of the Paleozoic Era. This important period saw the origin and rapid evolution of 
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