Methodological issues under the Kyoto Protocol Implications of the establishment of new hydrochlorofluorocarbon-22 ( HCFC-22 ) facilities seeking to obtain certified emission reductions for the destruction of hydrofluorocarbon-23 ( HFC-23 ) Background : The SBSTA , at its twenty-sixth session , considered the implications of the establishment of new hydrochlorofluorocarbon-22 ( HCFC-22 ) facilities seeking to obtain certified emission reductions ( CERs ) for the destruction of hydrofluorocarbon-23 ( HFC-23 ) .