W. Jackson Davis is a Berkely, Oregon and Stanford educated climate science who has studied historical estimates of temperature and CO2. He first explains how these are estimated historically using so-called proxies, and then how there is little correlation between the two phenomena and, when there is, it is generally temperature changes that precede changes in CO2 levels. This was document in a 2017 paper entitled, “The Relationship between Atmospheric Carbon Dioxide Concentration and Global Temperature for the Last 425 Million Years”. Davis does not believe CO2 is harmless, however, he does believe that it contributes to the acidification of the oceans.
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