- Thomas Heller, Stanford University, Etats-Unis. Precaution in international law and multilateral agreements.
- Poul Harremoës, Technical University of Denmark, Danemark. Choice of burden and level of proof.
Débat, modérateur :
- Laurence Tubiana, Iddri.
- Peter Beyer, Ecologic, Allemagne ; Jean Koechlin, Iddri, France.