Youth work across Europe has developed strong methodological traditions in intercultural learning, social inclusion and democratic participation. Environmental sustainability, however, remains comparatively underrepresented in non-formal education practice, despite young people consistently identifying climate change as among their top concerns. The Eurobarometer Special Report 513 (2021) found that 93% of EU citizens consider climate change a serious problem, yet environmental education remains unevenly integrated into non-formal education across member states. Youth workers, who play a critical role in shaping young people's awareness and civic engagement, often lack the specific competences to address environmental sustainability in their daily practice. This gap between the urgency of the environmental crisis and the preparedness of the youth work sector is the central problem this project addresses. Across the ten partner countries (Germany, Türkiye, Bulgaria, Estonia, Hungary, Italy, North Macedonia, Poland, Romania and France), this gap manifests differently. In rural communities served by LAG Agro Lider in North Macedonia and FIRE in Hungary, youth workers face limited access to quality training on green transition. In urban settings such as Berlin, Istanbul and Strasbourg, youth workers lack structured methodological tools to translate environmental awareness into educational practice. In coastal Constanta in Romania, young people are motivated but youth workers need practical competences to channel this into sustained community action. MTÜ Rabarada in Estonia identifies a need for connecting STEM-based environmental education with non-formal learning. The project delivers a seven-day training course in Istanbul, Türkiye (24 to 30 October 2026) for 34 youth workers from ten countries, facilitated by three experienced trainers, using participatory, learner-centred non-formal education methods to equip participants with the knowledge, skills and practical tools to integrate environmental sustainability into their youth work practice. From the perspective of youth work practice, the project pursues four objectives. First, to strengthen youth workers' knowledge base on environmental sustainability, including EU Green Deal priorities, ecological footprint concepts and the connection between local action and global frameworks. The Environmental Sustainability Quiz, Ecological Footprint Analysis and input sessions on Days 2 and 3 build foundational knowledge, while the Thematic Tree across Days 3 and 5 deepens understanding through evidence-based research. The GIZ study visit on Day 6 provides exposure to institutional sustainability programming. This knowledge equips youth workers to design substantive environmental education rather than relying on superficial awareness-raising. Second, to develop youth workers' practical facilitation competences through hands-on experience with diverse non-formal education methods directly transferable to local contexts. Each session models a specific replicable method: the Sensory Nature Walk develops experiential outdoor facilitation, the Sustainability Board Game builds gamification competences, Theatre Forum strengthens drama-based facilitation, the Mandala Collective Art develops creative group methods, Problem Tree Analysis and Diamond Ranking build analytical skills, and the Barometer develops structured debate facilitation. Youth workers leave with a comprehensive methodological toolkit for immediate application. Third, to foster intercultural exchange and professional peer learning among youth workers from diverse European contexts. Sustained collaboration in mixed international working groups develops intercultural facilitation competences essential for working with diverse youth populations. The NGOs Gallery creates mutual visibility across organisational approaches, while comparison of national realities builds understanding that effective environmental responses require cross-border collaboration. Youth workers gain competence to integrate intercultural dimensions into environmental education, recognising that sustainability challenges differ across geographical, economic and cultural contexts. Fourth, to create a lasting network of trained youth workers committed to integrating environmental sustainability into ongoing practice and conducting multiplier activities that extend the project's reach. The Transferability Workshop on Day 6 ensures methods are adapted for each participant's local context. SMART action plans on Day 7 formalise follow-up commitments with timelines, target groups, resources and risk analyses. Commitment Letters reinforce accountability three months later. This structured transfer ensures the training generates a cascading effect: 34 trained youth workers return to ten countries and reach additional young people through local workshops and campaigns, multiplying impact across the European youth work landscape.