I mean, we did? Atmospheric CO2 levels in the pre-tree era 400 Myears ago was something like above 6000ppm, compared to 280ppm in the pre-industrial era. Even

I mean, we did? Atmospheric CO2 levels in the pre-tree era 400 Myears ago was something like above 6000ppm, compared to 280ppm in the pre-industrial era. Even burning coal formed during this time like mad, 90% of the atmospheric CO2 is still just gone.