It is a misconception to think that trees, or any other plants, continue to exchange CO2 for oxygen for their entire lifetimes. Once they are fully grown, this process stops. Leaves fall, animals consume foliage and plants eventually die. These processes return CO2 to the atmosphere and an equilibrium forms where net carbon capture is balanced by carbon return. There would be about the same amount of carbon per hectare now as there was a couple of million years ago.
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It is a misconception to think that trees, or any other plants, continue to exchange CO2 for oxygen for their entire lifetimes. Once they are fully grown, this process stops. Leaves fall, animals consume foliage and plants eventually die. These processes return CO2 to the atmosphere and an equilibrium forms where net carbon capture is balanced by carbon return. There would be about the same amount of carbon per hectare now as there was a couple of million years ago.