Our students live in a changing world, receive messages from a threatened land and witness many conflicts and social inequalities. As future citizens, they must understand the global challenges that we have to face and propose measures to achieve a better world. We choose the UN sustainable development goals as the basis for working on these great global challenges. Using them as a base, we will carry out a collaborative work in which our students: • Work on the concept of sustainability and the global challenges we have to face to achieve it. • Analyse the main problems of the world, their causes and future consequences. • Propose different measures, both individual and collective, to fight against problems. Each School will select the goals to work depending on their students’ interests, and international teams will be formed to investigate and discuss about it. Proposals to face the problems will be made and added to a common goals map.