"Subjects such as clean energy, sustainable mobility and building are elements of the “Green Deal” promoted by the European Commission to tackle climate change and environmental challenges. The ""Fridays for future"" movement with its demand that ""something needs to be changed - now"" shows that young people want to be heard on ecological, political and social issues. The increasing ecological calamities worldwide make them not only think about the future of our planet but be ready to take action to protect the environment, e.g. by increasingly using renewable energy sources. At the same time, they realize the important role of civic societies and international cooperation in acting responsibly.The project “GoGreen” builds on these insights, addressing students and apprentices in vocational training at the three partner schools to provide them with knowledge and hands-on experience in the field of renewable energy (biogas, solar power, hydrogen) in the various professional areas (Germany: system planers and plumbers-to-be; Bulgaria: students in the agricultural and transport sectors; Czechia: apprentices in the transport sector).Along with increasing the students’ sensitivity and awareness regarding the environmental issues our societies are confronted with, the project sets out to increase their professional skills and stimulate their problem-solving competences when it comes to developing and applying practicable solutions. As the partner countries have very different presuppositions, information on and comparison of the similarities and differences in tackling ecological problems are vital to the project. The project comprises 4 interlinked phases of international cooperation with up to 30 students (10 from each country): In Germany we will focus on biogas, with work in international teams on theoretical background knowledge and hands-on application by building a model of a biogas plant and - at the end of the project - installing an aquaponic system in the school's garden.The exchange in Bulgaria will resume the results (e.g. by refining the biogas plant model) and focus on linking biogas and (re)afforestation, on how to use biogas e.g. in transportation, and on planning an aquaponic system.The third phase (in Czech Republic) will centre on solar energy and hydrogen, esp. hydrogen cells for cars. Her, some of the results of a previous Erasmus+ founded project between the Czech and German partner schools are taken up to share the insights and hands-on knowledge with the Bulgarian partners and to widen the perspectives for practicable solutions of using alternative sources of energy in various sectors of everyday life.The final exchange week (again in Germany) will sum up and join all results in a way to create synergies and investigate into solving the issues of energy supply by combining several alternative sources. As the added value of this final exchange the students will apply the insights when building an aquaponic system. All results will be presented to the wider public and the partners seek cooperation with organizations, companies and NGOs active in the energy sector (e.g. operators of biogas plants) as the topic is of major public interest everywhere.Along with gaining deep insights in renewable energy use, the students – who have to rely on English as a common language – will enhance their overall personal, social, intercultural competences and widen their perspectives and skills in cooperating in international teams. The coordinating teachers of all 3 schools bring their expertise in the various professional sectors addressed to the project and have a sufficient to good command of English so as to support the students throughout the project."