Carbon dioxide is essential for plants. Why do we consider it a pollutant?

  • A
    It is toxic to humans at low concentrations.
  • B
    It causes acid rain.
  • C
    Excessive concentration leads to global warming and the greenhouse effect.
  • D
    It depletes the ozone layer.

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$(a)$ What do the blanks $1, 2, 3, 4$ and $5$ in the given cycle stand for?
$(b)$ Name two natural and one man-made process by which $CO_2$ returns to the atmosphere.
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