I didn't make any claims on CO2 causing or not causing changing climate. I didn't make any claims as to if CO2 is a pollutant. I made not commentary what so ever on climate change, let alone whatever the drivers of it may be. It's not the topic of the post and I'm not sure why you jumped to that conclusion.
What I am talking about, is if humans, or any other organism, can measurably change the long term conditions on Earth. On that topic, I am claiming that it is undeniable that plant or animal activity on Earth CAN measurably change the level of atmospheric gases, both CO2 and oxygen. That is simple fact. It has happened many times, most notably with the advent of photosynthesis.
The carboniferous was not an oxidation event. It was a CO2 sequestration event. Which is what I said.
The 'Great Oxidation Event' (so named in literature - link:
https://asm.org/articles/2022/february/the-great-oxidation-event-how-cyanobacteria-change) relates to the oxidation
of the atmosphere due to the advent of photosynthetic bacteria, roughly 3bn years BEFORE the Carboniferous.
It is the exact OPPOSITE of what happens on Mars, or anywhere else in the solar system, which involves the REMOVAL of O2 from the atmosphere into oxides, in Mars' case primarily ferrous oxides, which is why Mars is red, and has basically no atmospheric oxygen to speak of (approx 1/10,000 of the level on Earth). I agree it's a confusing term because we typically think of 'oxidation' in terms of oxidizing metals or minerals, which is not what the event describes.
Overall, I think we're speaking across each other here, or you've misinterpreted what I've written. Hopefully this clarifies my position!