This of course ignores truly ancient levels... "a measurement of the fossil record using a new instrument has confirmed a portion of the model. Atmospheric CO2

This of course ignores truly ancient levels... "a measurement of the fossil record using a new instrument has confirmed a portion of the model. Atmospheric CO2 level 1.4 billion years ago was at least ten to 200 times greater than today" https://www.sciencedaily.com/releases/2003/09/030918092804.htm https://www.sciencedaily.com/releases/2003/09/030918092804.h...