ShandraStrosin t1_j9qe2q5 wrote
No, it doesn't necessarily mean that other gases like O2 are decreasing. The increase in CO2 is due to human activities like burning fossil fuels, and it's causing a shift in the composition of the atmosphere.
konwiddak t1_j9r77ir wrote
The amount of O2 in the atmosphere has decreased, but it's only a fraction of a percent.
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