| wiss. Beirat/Kuratorium/Institut | Advisory Board of the European Environment Agency | Dänemark | Mitglied | 01/2004
                -
                12/2005 | Member of the Advisory Board | 
| wiss. Beirat/Kuratorium/Institut | Advisory Board on Global Change and Sustainable Development, United Nations Department for Policy Co | Internationale Organisation | Mitglied | 01/1996
                -
                12/1997 | Member fo the Advisory Borard on Global Change and Sustainable Development | 
| wiss. Beirat/Kuratorium/Institut | Advisory Panel on Environmental Outlook and Strategy, OECD | Frankreich | Mitglied | 01/1998
                -
                12/2002 | Member of the Advisory Panel, Environmental Outlook and Strategy Project,  Organisation for Economic Co-operation and Development (OECD), Paris, France. | 
| wiss. Beirat/Kuratorium/Institut | Energy Advisory Group Member of Research Center Jülich | Deutschland | Mitglied | 01/2004
                -
                12/2006 | Member of the Energy Advisory Group | 
| wiss. Beirat/Kuratorium/Institut | European Commission High-Level Expert Group on Foresighting the New Technology Wave | Belgien | Mitglied | 01/2002
                -
                12/2005 | Member of the EC High-Level Expert Group on "Foresighting the New Technology Wave", | 
| wiss. Beirat/Kuratorium/Institut | InterAcademy Council (IAC) Steering Group on Transitions to Sustainable Energy | Niederlande | Mitglied | 01/2002
                - | Member of InterAcademy Council (IAC) Steering Group Transitions to Sustainable Energy | 
| wiss. Beirat/Kuratorium/Institut | Member fo the Scientific Steering Committee of the Global Carbon Project | Australien | Mitglied | 01/2004
                - | Member of the Scientific Steering Committee | 
| wiss. Beirat/Kuratorium/Institut | Member of the Board of the Asian Energy Institute based at TERI, New Delhi | Indien | Mitglied | 01/1997
                - | Member of the Board | 
| wiss. Beirat/Kuratorium/Institut | Member of the Energy and Environment Steering Committee (EESC), World Bank | Vereinigte St. v. Amerika | Mitglied | 01/1996
                -
                12/1998 | Member of the Energy and Environment Steering Committee (EESC) | 
| wiss. Beirat/Kuratorium/Institut | Member of the Research Advisory Committee, Institute for Global Environmental Strategies (IGES) | Japan | Mitglied | 01/1998
                -
                12/2005 | Member of the Research Advisory Committee | 
| wiss. Beirat/Kuratorium/Institut | OMV FUTURE ENERGY FUND | Österreich | Vorständin/Vorstand | 06/2006
                - | Vorsitzende des Beirates | 
| wiss. Beirat/Kuratorium/Institut | Steering Committee on New Integrated Scenarios, Intergovernmental Panel on Climate Change (IPCC) | Schweiz | Mitglied | 10/2006
                - | Member of IPCC Steering Committee on New Integrated Scenarios | 
| wiss. Beirat/Kuratorium/Institut | Steering Committee, International Programme on the Economics of Atmospheric Stabilization | Großbrit. u. Nordirland | Mitglied | 01/2002
                -
                12/2005 | Steering Committee Member of International Programme on the Economics of Atmospheric Stabilization (IPEAS) | 
| wiss. Beirat/Kuratorium/Institut | Steering Group of the Study Group on Energy Technologies in the 21st  Century, WEC | Großbrit. u. Nordirland | Mitglied | 01/2002
                -
                12/2004 | Steering Group Member of the Study Group on Energy Technologies in the 21st Century, World Energy Council (WEC) | 
| wiss. Beirat/Kuratorium/Institut | Task Force on New Emissions Scenarios of the Intergovernmental Panel on Climate Change (IPCC) | Schweiz | Mitglied | 01/2004
                -
                05/2006 | Member of the Task Forse | 
| wiss. Beirat/Kuratorium/Institut | United Nations Sigma Xi Scientific Expert Group on Climate Change and Sustainable Development | Vereinigte St. v. Amerika | Mitglied | 01/2005
                - | Member of the UN SEG (United Nations Sigma Xi Scientific Expert Group) on Climate Change and Sustainable Development | 
| wiss. Beirat/Kuratorium/Institut | Working Group on Coupled Modelling, Joint Scientific Committee for the World Climate Research Progra | Schweiz | Mitglied | 01/2006
                - | Member of the Working Group on Coupled Modelling, Joint Scientific Committee for the World Climate Research Programme | 
| wiss. Beirat/Kuratorium/Institut | Working Group on Energy and Sustainable Development, International Council for Science (ICSU) | Frankreich | Mitglied | 01/2002
                -
                12/2005 | Member of International Council for Science (ICSU) Working Group ¿Energy and Sustainable Societies¿ |