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Ozone-depleting substances emitted through human activities cause large-scale damage to the stratospheric ozone layer. Consequently, the production of many of these substances has been phased out; prominent examples are the chlorofluorocarbons (CFCs), and their intermediate replacements, the hydrochlorofluorocarbons (HCFCs). So far, seven types of CFC and six types of HCFC have been shown to contribute to stratospheric ozone destruction. Here, scientists report the detection and quantification of a further three CFCs and one HCFC. [Source: Nature Geoscience]
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