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Ocean acidification: cooler or not, reason to take CO2 seriously : Comments
By Steven Watkinson, published 11/7/2008Forget forecasts of global warmth, ocean pH levels are the thing to watch.
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Atmospheric CO2 levels were similarly high through the Ordovician. Note that fauna of the period included large diversity of corals, bryozoans, bivalves and gastropods (we know most about these because shells and skeletal remains fossilise best). The biosphere works just fine with much higher levels of atmospheric carbon dioxide -- only people with nothing better to do worry about it.