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New cars sold in much of the world since this agreement have used R134a refrigerant in their climate-control systems. It is a hydrofluorocarbon, which contains no chlorine. In the years since the ban of refrigerants containing chlorine, the ozone hole has receded.
Source: wiktionary
The measure would curb the production and use of potent planet-warming chemicals called hydrofluorocarbons, or HFCs, which are used in air-conditioners and refrigerators.
Source: wiktionary