what to you mean by (CFC) and weather they are good or bad for the atmosphere 

Please follow the link:-
https://www.meritnation.com/ask-answer/question/what-is-cfc/academics/6768602  

When released into the air these CFC's rise high up in the atmosphere and destroy the ozone layer, as the ozone layer protects earth from harmful UV rays coming from the Sun, Its destruction has lead to the problem of global warming.

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