Draft Report of the 30th Session of the IPCC Page: 4
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Mr Field, WG II Co-Chair, presented on behalf of WG I and WG II the proposal for an Expert Meeting on
Detection and Attribution Related to Anthropogenic Climate Change to be held next September in Geneva.
The Panel approved the organization of this meeting and requested that the organizing committee, to be
chaired by Mr Field, cover a broad range of aspects, including regionalization aspects and WG III
perspectives, specifically socio-economic factors.
Mr Edenhofer, WG III Co-Chair, presented on behalf of WG III the proposal for an Expert Meeting on
Human Settlements, Water, Energy and Transport Infrastructure- Mitigation and Adaptation Strategies. The
Panel approved the organization of this meeting, to be held in 2010, and invited WG III Co-Chairs to form an
organizing committee which would refine the proposal taking into account comments received, and ensure
the participation of interested countries and of relevant WG II experts, in order to allow a good integration
between adaptation and mitigation aspects.
Mrs Christ presented comments from Governments and Organizations on the scoping for AR5, received
prior to the Session and collated under IPCC-XXX/INF.7. After a preliminary discussion on the proposals,
the Panel agreed to include them for consideration at the upcoming AR5 scoping meeting. The proposal for a
possible specific report on climate change impacts on ocean acidification and marine ecosystems raised
particular interest, and the Chairman suggested that an expert meeting be organized on the subject.
Work on new scenarios:
During consideration of the report from the Integrated Assessment Modeling Consortium Expert Group
regarding the lowest Representative Concentration Pathway (RCP), RCP3-PD, some questions were raised
on technical issues such as long term emission profiles and concern was expressed about the delayed
delivery of the report as well as ambiguities and potential policy prescriptive language. A contact group co-
chaired by Mr Meyer (Netherlands) and Mr Elgizouli (Sudan) was set up to consider those matters. The Co-
Chairs reported to the Panel that, according to the contact group, the Steering Committee on New Scenarios
had completed its work as mandated by the IPCC and they welcomed their report contained in IPCC-
XXX/Doc.18. Since there are time constraints on the scenario process, the contact group believed that the
work of the climate modelers should be taken up as soon as possible, using the proposed Reference
Concentration Pathways as input for their models. The contact group reaffirmed that the RCPs are not IPCC
scenarios like the SRES scenarios but tools to assist the climate modelers and the Integrated Assessment
Modelers to develop their projections and scenarios. In consideration of further scientific issues related to the
selected RCP IMAGE 2.6 scenario, it was suggested to ask, through the IPCC Chair, clarification from the
modelers concerning the peak-and decline behavior after 2100.
In its decision, the Panel expressed appreciation for the work of the Integrated Assessment Modeling
Consortium Expert Group (IAMC) and welcomed the fact that the robustness of the IMAGE 2.6 scenario had
been established for its use in the RCP 3-PD. The IPCC invited the IAMC to provide information on how
this RCP will be extended to 2300, recalling the characteristics identified at the Expert Meeting
Noordwijkerhout, September 2007, namely that it follows a peak and decline shape and exhibits net negative
emissions toward the end of the century, and the significant policy and scientific interest in radiative forcing
pathways that continue to decline. The Panel encouraged the scientific community to make use of the reports
of the expert meetings on new scenarios under the AR4, including its references to comparability of new
emission scenarios with the old SRES scenarios.
The Panel further agreed to set up a Task Group to consider further activities consistent with the catalytic
role of the IPCC in scenario development as follows. The Task group will be co-chaired by Mr Qin Dahe
(Co-Chair of WG I) and Mr Chris Field (Co-Chair of WG II) and will be comprised of Mr Carraro,
Edenhofer, Elgizouli, Lee, Meyer, Moss, Stocker, van Ypersele.
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The U.S. Climate Change Science Program (CCSP). Draft Report of the 30th Session of the IPCC, text, April 2009; Geneva, Switzerland. (https://digital.library.unt.edu/ark:/67531/metadc11916/m1/4/: accessed April 23, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; .