The idea of ecotourism is being promoted and supported, by growing numbers of people and groups in different parts of the world, as a major means of dealing with the damaging effects of tourism. Yet the meaning of the term varies among different people, projects, and places. Evidence from national parks, where this type of tourism has been promoted for many years, shows that such tourism can cause substantial long-term cumulative changes in environment. Concepts such as ecotourism, green tourism, and sustainable tourism development, are general in their nature and have to be described, planned, and assessed, in detail on the ground in terms of the socioeconomic and environmental conditions applying in different places. In this respect, careful planning and management procedures are needed not only for ecotourism but indeed for all forms of tourism.