[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.

[dirtbiker]

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

Of that, mankind is "supposed" to be responsible for 3%, or 0.0012% of the total amount of CO2.