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    Why do CFC's remain in the atmosphere for so long?
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    They do not stay in the atmosphere, when they are released they are not very dense so they tend to rise, when they rise they bond to the ozone in the atmosphere and take the ozone with them out into space, this os ozone depletion. I think what your confused with is global warming and your question should be why does CO2 and CH4(carbon dioxide and methane) stay in the atmosphere for a long time, there are many answers to this question, one is that deforestation is increasing or another one would be that the population of living things on this planet is increasing so more things are respireing.
 
 
 
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