The "Mirror Mirror, tell me how is the sea" project is a Youth Exchange project that brings together 5 European structures around the theme of Sustainable Tourism. Together, we wanted to interview young Europeans about their point of view on Sustainable Tourism. Our objective is to make young people aware of their European citizenship and of the protection of the maritime environment as being one of the axes of Sustainable Tourism. Raise awareness, respect and initiate. We wanted to give young people the means to understand the environment by setting up activities and interventions related to our theme: sustainable tourism. Climate protection is the concern of many citizens today (fortunately!). A large majority have already changed their daily living habits. But, as tourist structures, we realize that these habits are disappearing: chemical sunscreens that destroy the oceans, cigarette butts on the beaches, food consumption that does not correspond to the calendar of local productions ..