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Never, CO2 is not harmful or poisonous in the atmosphere.

It IS poisonous in large concentrations in the oceans, as is produces carbolic acid which is not quickly removed by plankton. Algae blooms as a result of this and fertilizer runoffs produces dead zones at the mouths of rivers.

CO2 in the atmosphere is the second most prevalent greenhouse gas at about 400 parts per million (0.0004%) presently, behind water vapor, typically between 3 and 10%, dependent upon relative humidity.

Plants convert CO2 to oxygen and sugars by photosynthesis, there is not enough plant life to convert all the CO2 in the atmosphere. Plankton ( primarily, green algae and cyanobacteria) in marine environments provide about 70% of the free oxygen produced on Earth and damaging marine environments can destroy these.

**the term plankton also comprise micro-cellular animals (diatoms), it is a food source for many marine animals including baleen whale species. (humpbacks, right whales, blue whales, fin whales, minke whales and others)

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