The book incorporates informal photographs related to nature and its links, it is an imminent visual book, without further pretensions. To have a good ratp.Today we are witnessing a true race on the part of the world's leading economies worldwide. They all want to assume leadership in the field of sustainability, beyond the deployment of renewable energies, energy efficiency, biofuels, etc. It includes the development of a new economic model based on innovation. We have to see what are those trends that will have an influence on the economic, political and social model during the next 50 years. In this third part we continue with observation tourism