[ROCKLOBSTER]

You don’t need a stupid study.

There is virtually NO CO2 in the atmosphere.

[Olog-hai]

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There is virtually NO CO₂ in the atmosphere

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No, there has to be enough for the plants to breathe in. Beyond that, 392 parts per million (0.0392%) is utterly minuscule.

[burroak]

To visualize what your comment is saying, a green garden pea dropped in an empty 5 gal bucket fairly represents to ratio of CO2 to the entire atmosphere.

Anyways, CO2 is just fertilizer which plants use to produce more oxygen.