| scientific committee/curatorship/institute | Advisory Board of the European Environment Agency | Denmark | Member | 01/2004
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12/2005 | Member of the Advisory Board |
| scientific committee/curatorship/institute | Advisory Board on Global Change and Sustainable Development, United Nations Department for Policy Co | International Organization | Member | 01/1996
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12/1997 | Member fo the Advisory Borard on Global Change and Sustainable Development |
| scientific committee/curatorship/institute | Advisory Panel on Environmental Outlook and Strategy, OECD | France | Member | 01/1998
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12/2002 | Member of the Advisory Panel, Environmental Outlook and Strategy Project, Organisation for Economic Co-operation and Development (OECD), Paris, France. |
| scientific committee/curatorship/institute | Energy Advisory Group Member of Research Center Jülich | Germany | Member | 01/2004
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12/2006 | Member of the Energy Advisory Group |
| scientific committee/curatorship/institute | European Commission High-Level Expert Group on Foresighting the New Technology Wave | Belgium | Member | 01/2002
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12/2005 | Member of the EC High-Level Expert Group on "Foresighting the New Technology Wave", |
| scientific committee/curatorship/institute | InterAcademy Council (IAC) Steering Group on Transitions to Sustainable Energy | Netherlands | Member | 01/2002
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| Member of InterAcademy Council (IAC) Steering Group Transitions to Sustainable Energy |
| scientific committee/curatorship/institute | Member fo the Scientific Steering Committee of the Global Carbon Project | Australia | Member | 01/2004
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| Member of the Scientific Steering Committee |
| scientific committee/curatorship/institute | Member of the Board of the Asian Energy Institute based at TERI, New Delhi | India | Member | 01/1997
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| Member of the Board |
| scientific committee/curatorship/institute | Member of the Energy and Environment Steering Committee (EESC), World Bank | United States of America | Member | 01/1996
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12/1998 | Member of the Energy and Environment Steering Committee (EESC) |
| scientific committee/curatorship/institute | Member of the Research Advisory Committee, Institute for Global Environmental Strategies (IGES) | Japan | Member | 01/1998
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12/2005 | Member of the Research Advisory Committee |
| scientific committee/curatorship/institute | OMV FUTURE ENERGY FUND | Austria | Chairman | 06/2006
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| Vorsitzende des Beirates |
| scientific committee/curatorship/institute | Steering Committee on New Integrated Scenarios, Intergovernmental Panel on Climate Change (IPCC) | Switzerland | Member | 10/2006
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| Member of IPCC Steering Committee on New Integrated Scenarios |
| scientific committee/curatorship/institute | Steering Committee, International Programme on the Economics of Atmospheric Stabilization | Great Britain & N.Ireland | Member | 01/2002
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12/2005 | Steering Committee Member of International Programme on the Economics of Atmospheric Stabilization (IPEAS) |
| scientific committee/curatorship/institute | Steering Group of the Study Group on Energy Technologies in the 21st Century, WEC | Great Britain & N.Ireland | Member | 01/2002
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12/2004 | Steering Group Member of the Study Group on Energy Technologies in the 21st Century, World Energy Council (WEC) |
| scientific committee/curatorship/institute | Task Force on New Emissions Scenarios of the Intergovernmental Panel on Climate Change (IPCC) | Switzerland | Member | 01/2004
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05/2006 | Member of the Task Forse |
| scientific committee/curatorship/institute | United Nations Sigma Xi Scientific Expert Group on Climate Change and Sustainable Development | United States of America | Member | 01/2005
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| Member of the UN SEG (United Nations Sigma Xi Scientific Expert Group) on Climate Change and Sustainable Development |
| scientific committee/curatorship/institute | Working Group on Coupled Modelling, Joint Scientific Committee for the World Climate Research Progra | Switzerland | Member | 01/2006
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| Member of the Working Group on Coupled Modelling, Joint Scientific Committee for the World Climate Research Programme |
| scientific committee/curatorship/institute | Working Group on Energy and Sustainable Development, International Council for Science (ICSU) | France | Member | 01/2002
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12/2005 | Member of International Council for Science (ICSU) Working Group ¿Energy and Sustainable Societies¿ |