This technical paper was prepared by the secretariat to facilitate the consideration by Parties of agenda item 5 (b) of the twenty-second session of the Subsidiary Body for Scientific and Technological Advice. It presents major issues that are being raised by experts in connection with potential clean development mechanism project activities that seek to earn certified emission reductions (CERs) by incinerating hydrofluorocarbon 23 waste streams from hydrochlorofluorocarbon 22 (HCFC-22) production. Such issues include the potential impact of the revenue stream from CERs on the level and location of HCFC-22 production and implications for the achievement of objectives under the Montreal Protocol on Substances that Deplete the Ozone Layer, notably relating to the eventual phasing out of such production in developing countries, and
under the UNFCCC