konwiddak t1_j9r6hx6 wrote
Reply to comment by furtherdimensions in eli5: Since CO2 is increasing in the atmosphere, does that mean O2 or other gases are decreasing ? by Ok_Gas_6560
The CO2 weighs more but has the same volume as the O2 it replaced. However you've missed the face we've also burned a bunch of hydrogen since almost everything we burn is a hydrocarbon. This produces water (H2O) which precipitates out of the atmosphere with a net result of depleting the amount of oxygen atoms in the air. (See my longer answer).
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