This article presents a STEAM project, “Sustainable City”, based on educational robotics whose objective is to bring the problems of climate change closer to primary school students. The participants were 30 students (aged 10–11) from 5th year of Primary Education and the project consisted of 14 sessions in which different active methodologies such as project-based learning, collaborative learning and the flipped classroom were carried out. A pre-test and a post-test were carried out and the results were better in the post-test, which indicates that the students improved their skills and increased their motivation. As a conclusion, this STEAM project, which is adapted to the Spanish LOMCE curriculum, can be a reference for other teachers to bring their students closer to the problem of environmental change through educational robotics and the use of active methodologies.