EN-11. Nature and progress EN-2. Biodiversity: state or dynamics ? EN-10. Why should we worry about biodiversity ? EN-9. Biodiversity: perception and uses EN-8. Current state of the planet and of the biodiversity EN-7. Records of the biodiversity crisis EN-6. The main crisis of biodiversity EN-5. The history of biodiversity EN-4. Origins of life EN-3. Origins of life: the context EN-1. Definition of biodiversity Definition and lesson learned from the past crisis 7. Enregistrement des crises de la biodiversité 4. Les origines du vivant 3. Origines de la vie : le contexte 11. Le progrès 10. Pourquoi faut-il se préoccuper de la biodiversité ? 9. Biodiversité : perception et usages