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Belisaurius555 t1_jadzz70 wrote

Both. There are quadrillions of tons of atmosphere on Earth and it's composition doesn't change over night. At the same time, most plants and algae will absorb CO2 and release oxygen. They'd also absorb oxygen but most plants need the extra carbon more than they need the spare oxygen. Mind, this only works so long as we aren't destroying plants and algae while simultaneously dumping CO2 into the atmosphere.

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