During the pre-Cambrian era 550 million years ago (that's when it ended) atmospheric CO2 was as high as 7000 ppm. There wasn't much complex life on Earth then, and that ended with the Cambrian era explosion of life with most all of the planet's major phyla developing then for a few decades. That life growing scrubbed much of the CO2 from the atmosphere because plants take in CO2 and release oxygen. CO2 was present from many natural inorganic sources in a low-life environment.
So mankind in reducing plant ecosphere health along with destruction of major elements of phyla so far as they can work toward a pre-Cambrian, carboniferous way of being. Like those breathing auto and diesel exhaust occupationally the effects of deoptimalizing creative intelligence may be less noticed by the victims. As CO2 increases ,deniers that it is harmful become less able to comprehend the reduction in their own potential.
https://en.wikipedia.org/wiki/Carbon_dioxide_in_Earth's_atmosphere
During the quaternary glaciation 2 million years ago atmospheric CO2 was as low as 280 ppm. Mankind developed into a modern form with large functioning brains in that low CO2 era. Increasing Co2 to 400ppm as as present with all of the pollution probably tends to dumb people down as would putting a plastic bag over your head and rebreathing CO2.
https://en.wikipedia.org/wiki/Cambrian_explosion
So mankind in reducing plant ecosphere health along with destruction of major elements of phyla so far as they can work toward a pre-Cambrian, carboniferous way of being. Like those breathing auto and diesel exhaust occupationally the effects of deoptimalizing creative intelligence may be less noticed by the victims. As CO2 increases ,deniers that it is harmful become less able to comprehend the reduction in their own potential.
https://en.wikipedia.org/wiki/Carbon_dioxide_in_Earth's_atmosphere
During the quaternary glaciation 2 million years ago atmospheric CO2 was as low as 280 ppm. Mankind developed into a modern form with large functioning brains in that low CO2 era. Increasing Co2 to 400ppm as as present with all of the pollution probably tends to dumb people down as would putting a plastic bag over your head and rebreathing CO2.
https://en.wikipedia.org/wiki/Cambrian_explosion
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