Answer:
Carbon dioxide gas is necessary for plants to performs photosynthesis.
It is also a greenhouse gas. Up to certain concentration (approx 350 ppm) in
atmosphere, it is both good raw material as well as essential for keeping the
Earth warm. But, when concentration of 
from
certain level rises it becomes a pollutant because it results in global
warming. Due to which temperature of the Earth will increase and polar ice and
glaciers will start melting.
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