You're right, but what is being asked is the reduction of the levels of CO2, not the elimination of CO2. Plants can live healthily with 0.03% carbon dioxide in the air.
What is happening is that with all those burning and deforestation, the level might rise. And this will amplify the greenhouse effect of carbon dioxide. When the temperature rises, you should know what will then follow.
Animals can live without carbon dioxide, and they will always produce it, so that plants will never get 'too little' carbon dioxide. Furthermore, they too respire and hence, they too produce carbon dioxide in small amounts.
Conclusion, even if we succeed to remove all the carbon dioxide, a little will be produced nearly immediately by the billions of people and animals and plants while in some places, carbon dioxide will be released from their trapped form (dissolved for example in water).
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