
John Cook says that volcanoes produce harmless amounts of CO2 :
Published reviews of the scientific literature by Moerner and Etiope (2002) and Kerrick (2001) report a minimum-maximum range of emission of 65 to 319 million tonnes of CO2 per year. Counter claims that volcanoes, especially submarine volcanoes, produce vastly greater amounts of CO2 than these estimates are not supported by any papers published by the scientists who study the subject.
http://www.skepticalscience.com/volcanoes-and-global-warming.htm
Then today, we hear that CO2 from volcanoes caused mass extinctions :
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