Using these criteria, alternative tourism surpasses purely a concern for the physical environment which typifies green tourism, to include economic, social and cultural considerations. If the physical, environmental and cultural dimensions of the environment are considered in an integrated fashion, and tourism is developed with the previously shown characteristics then alternative tourism can be viewed as synonymous with the concept of sustainable tourism development. A kind of tourism that is often associated with the characteristics of alternative tourism outlined above is 'ecotourism'. However, like the concept of alternative tourism, there is no consensus about the meaning of ecotourism, which will be discussed in more detail below.