Chapter 5 focuses on environmental protection in the sports realm, particularly the cooperation between the IOC and UNEP. The study, however, expands beyond these two organizations and looks at the broader network that was established between the sports sector and public actors. This case study shows how the initial collaborative project over time led to more stabilized structures through which environmental protection requirements where fostered. Focus in the study is put on the interplay between the transnational level and the regional or national one. The book uses social science literature on ‘mega-events’ to depict how political and cultural transformations are inspired and accelerated by an event such as the Olympic Games. Commitments by the local organisers as formalised in host city contracts often require significant (legal) transformations and investment in environment-related (infrastructural) projects. As such, the Games can function as a catalyst for increased environmental protection. On the other hand, transformations can also take place at the transnational level, inspired by the local developments. The Chapter will pay significant attention to this interplay.