In 1997, Brazil proposed a method to calculate contributions of emission sources to climate change. Although the original application to emissions reduction targets was not pursued, continued interest in the scientific and methodological aspects of the proposal by Brazil led to a series of expert meetings, followed by model inter-comparison exercise on “Attribution of Contributions to Climate Change”.
The SBSTA, at its seventeenth session, agreed that work on the scientific and methodological aspects of the proposal by Brazil should be continued by the scientific community, in particular to improve the robustness of the preliminary results and to explore the uncertainty and sensitivity of the results to different assumptions.
Subsequent to this agreement the governments of UK, Brazil and Germany took the initiative to organize an expert meeting in September 2003 that formed the Ad Hoc Group on Modelling and Assessment of Contributions to Climate Change (MATCH).
Based on the conclusions of the SBSTA, the aim of MATCH is to improve the robustness of calculations of contributions to climate change due to specific emissions sources, building on the proposal by Brazil, and to explore the uncertainty and sensitivity of the results to different assumptions. The aim is to provide clear guidance on the implications of the use of the different scientific methods, models, and methodological choices. Where scientific arguments allow, the group would recommend one method/model/choice or several possible methods/models/choices for each step of the calculation of contributions to climate change, taking into account scientific robustness, practicality and data availability. Outputs of the group are primarily articles for the peer-reviewed scientific literature.
MATCH is guided by a Scientific Coordination Committee, consisting of several experts engaged in the research on this issue including representatives from Brazil and the UK. All papers, meeting details and organizational matters are published on http://www.match-info.net
MATCH reported progress to the SBSTA in June 2004 and May 2006. The SBSTA agreed that scientists should complete their work, so that it can be given final consideration by the SBSTA in June 2008.