For anyone interested in mountain geographies, landscapes, and human ecology within, Mountain Geography: Physical and Human Dimensions by Price et al is a highly recommended resource.
While eco-tourism is one topic that merits consideration in the quest for best sustainability practices, it is but a small part of what must be a broad mission in building sustainability awareness.
As one of the world’s largest and fastest growing industries, tourism will continue to place stress on natural environments, habitats, communities, and cultures.