Note by the secretariat 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 COP , by its decision 12/CP.10 , requested the SBSTA , in collaboration with the Executive Board of the clean development mechanism ( CDM ) , to develop a recommendation to the Conference of the Parties serving as the meeting of the Parties to the Kyoto Protocol ( COP/MOP ) , at its first session , relating to implications of the implementation of project activities under the CDM for the achievement of objectives of other environmental conventions and protocols , in particular the Montreal Protocol on Substances that Deplete the Ozone Layer ( Montreal Protocol ) .