Even apparently there is not agreement.
Long Invisible, Research Shows Volcanic CO2 Levels Are Staggering (Op-Ed)
The highest estimates in that article are 0.6 billion tons of CO2 per year, so that is still well below the 29 billion tons released by humans each year.
We also have hundreds of thousands of years of ice core data. CO2 never gets much above 300 ppm and crashes to well below 200 ppm. We have gone from 280 ppm to over 400 ppm in just 150 years. Do you think it is just a coincidence that this sudden and completely never before seen increase in CO2 occurred during a time when we were releasing billions of tons of CO2 into the atmosphere?
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