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Chlorofluorocarbons were phased out under the Montreal Protocol because they

  • A.Contribute to acid rain
  • B.Deplete stratospheric ozone
  • C.Form photochemical smog
  • D.Are acutely toxic

Answer: B

Chlorine released by ultraviolet photolysis catalytically destroys ozone, and a single atom can consume many thousands of molecules. Their long atmospheric lifetime means the recovery of the ozone layer will take several decades.

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