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because CFCs are heavier than air, it takes years to reach the stratosphere and decades to be converted by sunlight into a form that hurts the ozone. So the damage we see now is actually the result from decades ago.
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Fun Fact: because CFCs are heavier than air, it takes years to reach the stratosphere and decades to be converted by sunlight into a form that hurts the ozone. So the damage we see now is actually the result from decades ago.
Source
science.nasa.gov
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