The research projects at Fondazione Mattei have for some time now been dealing with the international dimension of environmental policy. Indeed, most environ mental phenomena have international implications, which stem from a number of factors: physical ones, such as the transnational or global consequences of pollution and resource conservation; technological factors, such as technological cooperation and diffusion; and economic factors, such as trad, plant localiza tion and migrations. Even in the absence of transnational pollution, therefore, the environmental issues involve substantial...