This study aims to identify and characterize the understanding of the concept of Sustainable Development in the official scientific educational documents of basic education in Portugal. Methodologically, it is a qualitative study that fits into the interpretive paradigm; its implementation is based on an interpretative-descriptive strategy of exploratory nature. The study involved the organization of the analysis corpus and the subsequent content analysis of the selected documents. The documents included in this corpus are the official educational documents on the teaching and learning of Natural Sciences in Basic Education (1st to 9th grade—ages 6 to 15): the Essential Learning and two transversal documents (the Student Profile on Leaving Compulsory Schooling and the Environmental Education Framework for Sustainability). The obtained results show that these documents frame and guide the implementation of Education for Sustainable Development, in all its dimensions, throughout basic education. However, this does not happen in an equitable way, neither in all documents nor in all years of schooling.

Science education plays a key role in promoting Education for Sustainable Development (ESD) through the training of informed and participatory citizens committed to the management of our planet and its resources. This work presents the design and assessment of an In-Service Teacher Education Program (ISTEP) through an Educational Design Research approach aiming at developing skills that make it possible to operationalize the experimental practical teaching of science topics, within the scope of ESD, in an articulated, coherent, and progressive way throughout Basic Education. It was implemented with 14 teachers from the three cycles of Portuguese Basic Education (ages 6–15), and focused on “Soils”. An integrated set of activities and respective didactic resources were co-built (the trainer-researcher with the in-service teachers) with a progressive, systematic, and sequential vision of the “Soils” theme. The content analysis of the teachers’ answers to questionnaires and during the final reflection point to an improvement in their practices regarding the ability to plan and design didactic resources on science topics from a Sustainable Development perspective. This ISTEP can be adapted to other themes and educational contexts, namely through close cooperation on education issues, which is one of the lines of action of the Community of Portuguese-Speaking Countries.

The curricular documents for Basic Education Sciences in Portuguese schools (ages 6 to 15) that currently affect teachers and students across the world integrate Sustainable Development concerns regarding soils. A sharp gap emerges between the official documents and the teachers’ perceptions of how to approach such issues. Urgent measures are required to bridge both worlds: reformulations of the official documents that guide teachers’ practices and educational resources focused on soils from a Sustainable Development perspective. A new organization of the curricular documents for this theme that aims to promote quality education among Portuguese Basic Education schools worldwide is proposed.