However, like other forms of development, tourism can also cause its share of problems, such as social dislocation, loss of cultural heritage, economic dependence and ecological degradation. Learning about the impacts of tourism has led many people to seek more responsible holidays. These include various forms of alternative or sustainable tourism such as: ‘nature-based tourism’, ‘ecotourism’ and ‘cultural tourism’. Sustainable tourism is becoming so popular that some say that what we presently call ‘alternative’ will be the ‘mainstream’ in a decade.