In an article summing up 20 years of research and debate on sustainable development and relating this to tourism, Andrew Holden concludes [1] (p. 372): “Thus, twenty years after the publication of the Brundtland Report…the subsequent advocating of sustainable tourism by international agencies including the United Nations World Tourism Organization (UNWTO), United Nations Environment Program (UNEP), United Nations Educational, Scientific and Cultural Organization (UNESCO), the European Union (EU), and the World Development Bank, the extent to which tourism’s relationship with the natural environment has ‘improved’, however we choose to conceptualize and measure it, is debatable and contentious”.