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Nothing is permanent on this planet. It recycles itself very efficiently. It looks after itself very well and does not need our "help".
I concur on this and your previous text. However, there are those that claim that human use of fossil fuels is causing an adverse change to climate by releasing ancient CO2. CO2 is a natural ingredient of our atmosphere in that it is well utilised by flora (both land-based and marine-based).
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I am not sure what you are getting at in reference to atmospheric oxygen percentage.
I can't remember the paper (but it seemed quite relevant) which disclosed that the percentage of oxygen locked into CO2 by combustion of fossil fuels is over and above that which is reduced by the production of CO2 alone.
I can only assume that this is due to the hydrogen cycle that produces 'new water' from the fossil fuel combustion process. There seems to be less degrees of freedom for the atomic breakdown of H2O than for CO2.
Best regards, suricat.