Duba wurin da ke ƙasa sannan ka amsa tambayar daga baya a cikin harshe ɗaya kamar yadda wurin yake:  Bayanin: A shekara ta 1970, bincike ya nuna cewa abubuwa masu guba da ake kira chlorofluorocarbons (CFCs) da 'yan Adam suka ƙera suna rage ƙwayoyin ozone da ke sararin samaniya. CFCs ne barga kwayoyin hada da carbon, fluorine, da kuma chlorine da aka yi amfani da prominently a kayayyakin kamar refrigerators. Barazanar da ke tattare da raguwar ozone ya tura batun zuwa gaba na al'amuran sauyin yanayi na duniya kuma ya sami ci gaba ta hanyar kungiyoyi kamar su Hukumar Kula da Yanayi ta Duniya da Majalisar Dinkin Duniya. An amince da Yarjejeniyar Vienna a taron Vienna na 1985 kuma ya fara aiki a shekarar 1988. Yarjejeniyar Vienna ta ba da tsarin da ya wajaba don ƙirƙirar matakan tsarawa a cikin hanyar Yarjejeniyar Montreal.  Tambaya: Menene babban aikin Yarjejeniyar Vienna?
ya samar da tsarin da ya wajaba don samar da matakan tsarawa a cikin hanyar yarjejeniyar Montreal