The RE4GREEN Training Materials comprise a suite of practical micro-modules designed to support the integration of environmental sustainability, climate responsibility, and eco-justice considerations into research and innovation (R&I) practices. Developed within the RE4GREEN framework, these resources equip researchers, students, citizen scientists, ethics reviewers, and research ethics educators with the knowledge, skills, and values needed to identify and address environmental and climate-related ethical challenges throughout the research process. The training materials translate RE4GREEN’s ethics and integrity framework into accessible, practice-oriented learning resources, fostering responsible research conduct and helping ensure that R&I activities effectively contribute to the European Green Deal and the transition towards a sustainable and socially just society.