Is there, globally, a balance of the concentrations of oxygen and carbon dioxide in the atmosphere?
Plants convert CO₂ to O₂,
and with the concentration of O₂, the tendency of plants to oxidize to CO₂ increases. That is, plants burn better with more oxygen.
Based on this there may be a feedback of increasing CO₂ concentration to increasing O₂ concentration back to increasing CO₂.
This feedback requires that plant growth increases with increasing CO₂ concentration.
Otherwise there would be only a limit to the oxygen concentration as at some concentration of O₂, even a wet rainforest burns explosively.
Does a feedback loop like that exist?