Does development mean employment and social welfare, or the natural environment, ecosystem, and biodiversity? The answer to this question is sought worldwide while trying to solve the dichotomy between ecological sustainability and the development sustainability. The authors observe a series of pursuits under the names of ecological tourism, environmentally friendly tourism, and socially responsible tourism that emerge in order to overcome this dichotomy in the tourism discipline. They all merge around the common idea of offering a framework that examines economic activities for this dilemma. Meanwhile, this chapter examines the pursuits within the scope of sustainable tourism based on the assumptions of principal ecological approaches (e.g., environment protection, shallow ecology, deep ecology, and social ecology) and determines the position of sustainable tourism within these ecological approaches. It is deduced that sustainable tourism is actually sustainable at very low levels from the perspective of ecological sustainability.