Answer:
Carbon dioxide gas is necessary for plants to performs photosynthesis. It
is also a greenhouse gas. Up to certain concentration (approx irately 350 ppm)
in atmosphere, it is both good raw material as well as essential for keeping
the earthworm. But, when concentration of 
from certain
level rises it becomes a pollutant because it. Causes greenhouse effect. It may
cause various respiratory disorders and also helps in the formation of smog.
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