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Submission + - High-carbon ice age mystery solved (newscientist.com) 1

BergZ writes: The Ordovician ice age happened 444 million years ago, and records have suggested that CO2 levels were relatively high then. But when Seth Young of Indiana University in Bloomington did a detailed analysis of carbon-13 levels in rocks formed at the time, the picture that emerged was very different. Young found CO2 concentrations were in fact relatively low when the ice age began.
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High-carbon ice age mystery solved

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Ocean: A body of water occupying about two-thirds of a world made for man -- who has no gills. -- Ambrose Bierce