Answer:
Plants utilise \[C{{O}_{2}}\] from the atmosphere for photosynthesis, thereby decreasing the amount of \[C{{O}_{2}}\]in the air. Deforestation leads to an increase in the amount of \[C{{O}_{2}}\] in the air because the number of trees which consume \[C{{O}_{2}}\] is reduced. Human activities thus contribute to the accumulation of \[C{{O}_{2}}\] in the atmosphere. \[C{{O}_{2}}\]traps heat and it doesn ?t allow it to escape into space. As a result, the average temperature of the atmosphere is gradually increasing. This is called global warming. Thus, increased \[C{{O}_{2}}\] contributes to global warming.
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