The Training Course TC "Environmental Training for Eco-Trainers" (ET4ET), taking place in Wiek (Rügen), Germany from 20-28 March 2015, gathered 35 youth workers or active members from 15 youth and environmental organisations of 12 different countries (Albania, Armenia, Czech Republic, France, Georgia, Germany, Latvia, Moldova, Romania, Serbia, Spain, United Kingdom) between 18-35 years. The German organisation FÖJ-AKTIV e.V. applied for the project out of the needs for (1) a rise in number and quality of environmental projects on local and international level, and (2) supporting and educating youth workers within the network and its members in the development of skills, competences and attitudes, identified by other organisations from their network organisation Youth and Environment Europe (YEE). The overall aim of the project ET4ET is to educate and empower new Eco-Trainers into effective leaders by providing them with new tools and methodologies to enable participants to prepare, run and evaluate Environmental Trainings for young people. This is aimed at individuals hoping to enhance their chances for future work in NGOs. Eco-Trainers are trainers who (1) facilitate environmental learning activities such as trainings in order to raise awareness of various environmental issues and the potential solutions and (2) add the environmental dimension to training-sessions (where training does not focus primarily on the environment e.g. soft skills, sessions on promotion etc.). Additionally, they can consult and contribute to the development and planning phases of a project itself in order to reduce its environmental impact. Thus, an Eco-Trainer is a combination of environmental educator, trainer and project manager. Environmental Trainings are organised and implemented in way that they have the lowest possible environmental impact in all areas: e.g. travel and transportation, food, venue and accommodation, materials, energy, waste, and water usage. The target group were participants with an environmental and/or educational backgrounds (through studies or work) and experiences in training courses and international projects who are actively involved in an environmental NGO and who want to become trainers. The TC applied methods from non-formal education as well as learning-by-doing and experiential learning. The participants prepared and ran a Trial Session as Eco-Trainers during the TC. Furthermore, some participants already implemented a training activity locally within their organisation after the TC. Another follow-up was the publication of the booklet ?Eco-Trainer Guide?, written by a team of participants, that contains a toolkit about methodologies and tools for planning and running Environmental Trainings as well as information about important trainer competences. Even after the end of this project, the YEE network continues to establish a ?Pool of Eco-Trainers? for future international environmental projects and plans another follow-up project (Training of Trainers) due to the high demand of applicants and good evaluation results.