breckenridgeback t1_jadkcjh wrote
Reply to comment by Moskau50 in ELI5 How does the 21% of oxygen on the atmosphere is maintained? Or it takes millions of years to change? by quiste_sacrocoxigeo
It's worth noting that CO2 levels are far lower than oxygen levels in the atmosphere, so it's much easier to change the (relative) amount of CO2 than it is to change the (relative) amount of O2.
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