"From 2016 to 2018, four schools - Germany, Sweden, Portugal and Finland - jointly carried out an Erasmus+ project with the theme ""Comparative studies for individual support and digital competence"". The cooperation between the schools proved to be very good, successful and pleasant. At the last meeting of the coordinating teachers, the participants decided to plan a new joint project on sustainability. In view of the climate change that can now be increasingly observed, everyone felt that this topic was urgent and cross-national. In the meantime, the Finnish school has joined another Erasmus+ project group. The three other schools decided to take a fourth school on board again. The Italian school, which had already taken part in many Erasmus+ projects, showed interest in the topic and joined the project group. This is considered an enrichment by all.So the four European schools have set themselves the goal of collectively addressing the issue of education for sustainability as a crosscurricular topic. Our main objectives are to make our students aware of their environment and the climate change. Teachers and everybody working at school have to take social and environmental responsibility. We want our students to become aware of environmental issues. We also want to raise the awareness their parents and the local communitiy about the importance to take care of our planet earth. It's our duty to encourage the young people to behave responsible and be proactive with nature. Not only our students but all people belonging to our school environment should understand how important the planned activities are. Other goals are the development of personal competences among the pupils and the continuation of the goal of the last project. This was the expansion of digital competences. Another key objective is to meet young people from other European countries. Through these encounters, the European idea, the importance of the European Union and friendship are spread across national borders.At every school Erasmus+groups will be established. In these groups there will be about 18 - 20 students per school. They will meet regularly with Erasmus+ teachers to discuss sustainability, identify regional environmental issues, plan activities and take part in mobilities to exchange ideas. The confrontation with our project title sustainability is to be worked on by all those involved in school life and by extracurricular groups as an superordinate topic. This is the only way to achieve long-term results. During the project phase and beyond, the topic of sustainability is dealt with in various subjects. The teachers of natural sciences, social sciences, nutrition, technology, computer science and English are particularly in demand. Theoretical and practical approaches are initiated in the lessons. The following methods and approaches are mentioned here as examples of our project work: Interwiews, discussions, experiments, evaluation of results, graphical representations, use of digital tools, presentation techniques, communication in the foreign language English. As an overall result we see the reduction of the ecological footprint of our schools. In concrete terms, this means that after taking inventory of school and regional problem areas we want to reduce or eliminate the problem. Here the activities reuse, reduce and reecyling are of particular importance. At the transnational meetings, activities are implemented that are exemplary for dealing with environmental problems. For example at the meeting in Portugal: collecting garbage on the beach, separating the garbage, recognising recyclable raw materials, putting up signs with tips on how to avoid garbage on the beach, summarize the activities, record results and process them so that they can be presented to others.As a joint result, we want to create a digital and a handmade handbook on sustainability in order to present our work to other schools and motivate them to imitate it. We hope that this will have a positive impact on our students in terms of increased environmental awareness and responsibility for this planet. Other impacts will be that students will be able to develop and implement personal competences such as self-confidence, responsibility, endurance, communication skills and digital competences in relation to lifelong learning. There will be several long-term benefits from the Erasmus+ project:- The development of a spiral curriculum on sustainability that will assign themes and activities to different subjects and grades.- The further cooperation with environmental groups and thus the deeper anchoring of the school in the community. - The awareness of pupils that it is a transnational issue and therefore the exchange between nations is necessary.- The solidarity with the participating countries and thus the further consideration of their problems and solutions.- Feeling the European idea and the importance of the European Union."