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-eighth session , recalled that the CMP recognized , in its decision 8/CMP.1 , that issuing certified emission reductions for the destruction of hydrofluorocarbon-23 ( HFC23 ) at new hydrochlorofluorocarbon-22 ( HCFC-22 ) facilities could lead to higher global production of HCFC-22 and/or HFC-23 than would otherwise occur and that the clean development mechanism ( CDM ) should not lead to such increases .