In numerous UN policy documents, a sustainable future through education is set in a key position; the UNESCO Global Action Programme on Education for Sustainable Development (UNESCO, 2018) is no exception. Therefore, it is of great importance to examine and report how different UN member countries work towards the implementation of sustainability at all levels of education. This article is a review of recently published research in Finland, with a focus on sustainability in the educational system. Specifically, the article deals with teacher education, combined with theoretical research around sustainability and systems thinking, to find a pathway forward. The main finding is that higher education in Finland cannot guarantee that student teachers are prepared enough to teach about sustainability. This issue is discussed and addressed in the last part of the article.