Question

Chlorofluorocarbons are destructive to the ________.

Answer 1

Chlorofluorocarbons are destructive to the ozone layer.
Once in the atmosphere, CFCs drift slowly upward to the stratosphere, where they are broken up by ultraviolet radiation, releasing the chlorine that catalytically destroys ozone.

Answer 2

Chlorofluorocarbons are destructive to the ozone layer in the upper atmosphere.