[newintellectual]

25,000 years ago, CO2 levels stood at 180 ppm - the lowest in 4.7 billion years of earth's history. About 30 ppm above the level at which RuBisCo stops effectively working, which would bring a halt to most photosynthesis on earth.

You can blindly accept dogma or you can think about the implications of that in light of fanatical calls to remove CO2 from the atmosphere - CO2 which has been steadily removed by long term geological processes, and which is now below the levels of over 99% of earth's history.