Intergovernmental Panel on Climate Change (IPCC)
- Second Assessment Report, Working Group II (1995) : Lead Author, Chapter 1 (Climate Change Impacts on Forests) and Contributing Author, Introductory Material A (Primer)
- Special Report “Land Use, Land Use Change and Forestry” (2000) : Lead Author, Chapter 2 (Global Perspective)
- Third Assessment Report, Working Group II (2001) : Lead Author, Chapter 5 (Ecosystems and their goods and services) and Chapter 13 (Europe)
- Fourth Assessment Report, Working Group II (2007) : Review Editor, Technical Summary (with D Murdiyarso, Bogor, Indonesia) and Chapter 4, “Ecosystems” (with S Diaz, Cordoba, Argentina)
- Fifth Assessment Report, Working Group II (2014) : Coordinating Lead Author, Chapter 18, “Detection and Attribution of Observed Impacts of Climate Change” (with G Yohe, USA) ; Lead Author, Technical Summary & Summary for Policymakers
- Fifth Assessment Report, Synthesis Report (2014) : Core Writing Team Member
- Special Report « Impacts of global warming of 1.5 °C above pre-industrial levels and related global greenhouse gas emission pathways, in the context of strengthening the global response to the threat of climate change, sustainable development, and efforts to eradicate poverty » (2018) : Lead Author, Chapter 1 (Framing and Context)
- Sixth Assessment Report, Working Group II (2021) : Coordinator, Cross Chapter Paper on the Mediterranean Basin, also Lead Author, Chapter 1 (Framing and Context)
- Scientific advisor of the German government delegation at several IPCC plenary sessions and national policy meetings
Intergovernmental Platform on Biodiversity and Ecosystem Services (IPBES)
- Member of the French government and/or ICSU delegation at several IPBES plenary sessions and national policy meetings
Millennium Ecosystem Assessment (2005)
- Scenarios Working Group : Convening Lead Author (with J Alcamo and D Van Vuuren), Chapter 9 (Changes in Provisioning and Regulating Ecosystem Goods and Services and their Drivers across Scenarios)
- Conditions and Trends Working Group : Lead author, Chapter 3 (Analytical Approaches for Assessing Ecosystem Condition and Human Well-Being)