The confluence of escalating global environmental and social challenges, including the pervasive impacts of climate change, the alarming rate of biodiversity loss, and widening societal inequalities, necessitates a fundamental re-evaluation of educational paradigms.1 These interconnected crises demand a holistic educational response that transcends traditional disciplinary boundaries, fostering a deep understanding of the complex relationships between human actions and planetary well-being. In this context, the concept of a "Sustainable Curriculum" has emerged as a critical framework for equipping learners with the knowledge, skills, values, and attitudes essential for navigating the complexities of the 21st century and contributing to a more just, equitable, and ecologically sound world.1 This necessitates a profound shift in educational focus, moving beyond simply imparting knowledge about sustainability to actively educating for sustainability and empowering transformative action.4 The evolution of this concept from its origins in environmental education to the broader notion of education for sustainable development signifies a crucial expansion in scope, now encompassing the critical social, economic, and cultural dimensions of sustainability.4
With the timeline for the United Nations' Sustainable Development Goals (SDGs) reaching its midpoint in 2025, the urgency for a widespread adoption of sustainable curriculum in education has intensified.12 Notably, the year 2025 appears as a significant marker in this transition, with certain regions already mandating the appointment of sustainability leads within schools, indicating a growing policy emphasis on this crucial area.15 This report aims to provide a comprehensive examination of the horizon of sustainable curriculum in education, particularly in the post-2025 era. Its objectives include defining the core principles and frameworks of sustainable curriculum, analyzing the compelling need for its urgent transition in light of global imperatives, exploring its transformative impact on preparing individuals for future challenges, investigating the integration of sustainable development goals across various educational settings, examining its influence on innovative pedagogical methodologies such as project-based learning and systems thinking, highlighting its role in fostering essential skills for the future of work and responsible global citizenship, showcasing innovative examples of its implementation worldwide, and finally, discussing the inherent challenges associated with its widespread adoption.