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glqsss
I could be wrong here but I think factories and animals are 2 ways carbon gets into the air because animals breath out carbon, while factories pollute the air with carbon. If anything I would think plants are responsible for removing it because they give out oxygen. 
lovelynoel13

Plants remove carbon dioxide from the atmosphere to be used in the process of photosynthesis. Plants use the carbon dioxide to make sugar in photosynthesis. 4 or D

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