Ozone layer depletion was not noticed until 1979, while CFC's have been around since 1920s. Why is this?
CFCs take time to enter the stratosphere and remain there for at least 60 years after their initial release
CFCs take time to enter the troposphere and remain there for decades after their initial release
CFCs have some 'down time' from when they enter the stratosphere and when they react forming chlorine atoms; the CFCs then react quickly and become harmless
Other chemicals are amplifying the effects of CFCs, allowing the chlorine to last longer in the atmosphere
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