Participants examine model units, grounded in authentic United Nations SDGs in which students build intercultural citizenship by addressing environmental challenges. Models of learning progressions at both Novice and Intermediate levels show how students build intercultural communicative competence solving real world problems through action projects. These units serve as models to illustrate the learning activities that build toward the summative tasks. Teachers discuss learning opportunities that allow students to apply communicative competence in action projects addressing environmental problems while demonstrating intercultural citizenship skills.