1. Each Party included in Annex I shall have in place, no later than one
year prior to the start of the first commitment period, a national system for
the estimation of anthropogenic emissions by sources and removals by sinks of
all greenhouse gases not controlled by the Montreal Protocol. Guidelines for
such national systems, which shall incorporate the methodologies specified in
paragraph 2 below, shall be decided upon by the Conference of the Parties
serving as the meeting of the Parties to this Protocol at its first session.
2. Methodologies for estimating anthropogenic emissions by sources and
removals by sinks of all greenhouse gases not controlled by the Montreal
Protocol shall be those accepted by the Intergovernmental Panel on Climate
Change and agreed upon by the Conference of the Parties at its third session.
Where such methodologies are not used, appropriate adjustments shall be applied
according to methodologies agreed upon by the Conference of the Parties serving
as the meeting of the Parties to this Protocol at its first session. Based on
the work of, inter alia, the Intergovernmental Panel on Climate Change and
advice provided by the Subsidiary Body for Scientific and Technological Advice,
the Conference of the Parties serving as the meeting of the Parties to this
Protocol shall regularly review and, as appropriate, revise such methodologies
and adjustments, taking fully into account any relevant decisions by the
Conference of the Parties. Any revision to methodologies or adjustments shall
be used only for the purposes of ascertaining compliance with commitments under
Article 3 in respect of any commitment period adopted subsequent to that
revision.
3. The global warming potentials used to calculate the carbon dioxide equivalence of anthropogenic emissions by sources and removals by sinks of greenhouse gases not controlled by the Montreal Protocol listed in Annex A shall be those accepted by the Intergovernmental Panel on Climate Change and agreed upon by the Conference of the Parties at its third session. Based on the work of, inter alia, the Intergovernmental Panel on Climate Change and advice provided by the Subsidiary Body for Scientific and Technological Advice, the Conference of the Parties serving as the meeting of the Parties to this Protocol shall regularly review and, as appropriate, revise the global warming potential of each such greenhouse gas, taking fully into account any relevant decisions by the Conference of the Parties. Any revision to a global warming potential shall apply only to those commitments under Article 3 in respect of any commitment period adopted subsequent to that revision.