"The Erasmus+-project „ resource-saving behavior: sustainable consumption, waste prevention, waste separation and recycling” took place in the years 2017-2019. Participating schools were the Schiller-Oberschule Sarstedt, Daugmales patmaskola (Latvia) und Debreceni Dózsa György AltalanosIskola (Hungary). Due to this partnership “gaining relevant skills and competences” and “education for sustainable development” were combined (sparsamer Ressourcenumgang – Strategie Europa 2020). Participants of our school were 14-16 year old students with a motivation for language proficiency, the European culture and environmental knowledge. The participating teachers were a native Hungarian, the project manager of the environmental school and an English teacher. Communication languages were German and English.The four project pillars (Rethink, Recycle, Reduce, Reuse) formed the concrete project framework. The three partner schools were now able to share their experiences, which they had already gained in the field of ""Environmental School in Europe"" with the other project schools. The student exchange program of the Erasmus + project (lessons, city rallies, science parks, company visits, leisure time in families) has been instrumental in improving the language skills of our students in terms of language fluency, grammar and vocabulary, openness in dealing with other languages or communication problems. The intercultural competences were also improved: The participants wanted to be good hosts, find new friends and learn about different cultures. The feedback from conversations, observations or written evaluations showed that the project went well.The students were supposed to learn how to communicate, act and make decisions so that they can participate in European communications. The high level of student motivation showed us that the ten sub-competences of the design competence of the transfer 21 program (Berlin 2007) were well suited to the implementation of the chosen priority ""acquisition of relevant skills and competences"".The students dealt with the environmental topics and were able to get their own statements and evaluations on self-developed and conducted surveys and interviews. Active learning methods and new technologies were used more often during the lessons. Interdisciplinary work was carried out during the lessons, project weeks or in working groups. New scientific methods were tested, the culture, history and geography of the partner countries were studied and some classes created upcycling products. Everything during the project was reflected and incorporated into the school’s curricula. Furthermore waste separation was introduced and organized in all rooms of the school building.The colleagues of the Erasmus+-teams quickly identified with the project. Regular meetings structured the project and promoted communication with the partner colleagues. The headmasters of the schools always took part in the projects. The schools from all three countries worked together and therefore a lot of different results can be used in the future (questionnaires about waste separation, way to school, e-mobility, statistics ""Ecological Footprint"", lectures on regional agricultural products, evaluation sheets). The partner schools were able to exchange good learning and teaching strategies and interesting topics of different regions.The participating students were involved in planning, implementing and evaluating the project. Individual projects were organized in the three schools with all pupils and colleagues, so that the project had a positive effect on the school communities and strengthened the environmental awareness of all students in terms of resource-saving consumption behavior, waste reduction and upcycling.Due to connections to local authorities, businesses and newspapers, the Erasmus+-project results are available for a wide audience. Also, the schools got a good reputation for taking part in the Erasmus+-project. Moreover all activities with the pupils and the results can be found on the homepage of the Schiller-Oberschule Sarstedt, Daugmales patmaskola and Debreceni Dózsa György AltalanosIskola."