I want to know the answer to the following question:
According to which entity can tourism be a tremendous development tool & means to preserving the cultural diversity of the planet?
All the background I'm provided with is that "Since the early 1990s, "even the non-ASEAN nations such as Cambodia, Laos, Vietnam and Burma, where the income derived from tourism is low, are attempting to expand their own tourism industries.". Is that enough to answer the question?