1. The science of ozone depletion : from theory to certainty 2. Diplomacy : the beginning, 1974-1987 3. Diplomacy : from strength to strength, 1988-1992 4. Diplomacy : racing towards success, 1993-2001 5. Technology and business policy 6. Implementation of the Montreal protocol 7. Compliance with the Montreal protocol 8. Media coverage of the ozone-layer issue 9. Environmental NGOs, the ozone layer and the Montreal protocol 10. Conclusion : a perspective and a caution.