Which of the following statements is correct?

  • A
    $CFC$s are discharged in the lower part of the atmosphere,move upward,and reach the stratosphere.
  • B
    The Montreal Protocol was signed to reduce $CO_2$ emissions.
  • C
    An ozone hole is a small pore created in the tropospheric ozone layer.
  • D
    Jhum cultivation is a method of afforestation.

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