Tristan Arnold. December 6 2016. Colorado State University.
You may be wondering about CFC's (chlorofluorocarbons), which are the most harmful greenhouse gas. The use of CFC's was eliminated in the 90's, but one CFC can take anywhere from 20-100 years to leave the atmosphere, and have been held accountable for over 80% of atmospheric depletion. Today the only CFC's are found in things like inhalers.
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