Our school's rallying theme is "There's sea and sea... there's a whole ocean to look after!" The initiative to operationalize this theme at the cluster level is part of a broader international movement that seeks to guide and operationalize strategic actions capable of protecting the oceans. UNESCO has defined 7 principles that promote ocean literacy. Our intention is to operationalize the following UNESCO principle: "Principle 6. The ocean and humanity are strongly interconnected." One of our guiding questions is "What plastics do we use in our school? How can we replace and/or eliminate it?". To answer this question, the students, in collaboration with their classmates, will carry out an audit on the presence of plastic in the schools of the school complex. This activity is based, on the one hand, on a holistic approach to the curriculum and, on the other hand, on a vertical articulation between different educational cycles. The Moinhos da Arroja School Complex is a BLUE SCHOOL.