Introduction: Sustainability as a Complex Educational Challenge

The climate crisis, environmental degradation, social inequality,and the ethical dilemmas of technological progress define the reality of the 21st century. These challenges are complex, interconnected and systemic—and cannot be meaningfully addressed through isolated disciplinary lenses. As a result, education itself must evolve.

Environmental sustainability education has been increasingly integrated into science curricula across Europe. However, its connection with mathematics—particularly within STEM and STEAM education—remains largely underexplored. This omission is critical. Mathematics is not merely a supporting tool; it is a core language through which climate models are built, data is interpreted, risks are predicted, and solutions are evaluated.

The Erasmus+ KA220 project Math4Sustainability responds directly to this gap by positioning mathematics as a central interdisciplinary bridge between environmental science, social responsibility, and democratic citizenship.

Interdisciplinarity: From Educational Trend to Pedagogical Necessity

Interdisciplinarity is often misunderstood as an optional innovation or enrichment strategy. In reality, it is a pedagogical necessity, shaped by both societal transformation and cognitive change.

As John Dewey famously argued, “We do not live in separate worlds… Connect school with life, and all studies will be connected necessarily” (Dewey, 1990). Today’s learners do not experience knowledge in disciplinary silos. They navigate a world of networks, systems, data flows and ethical interdependencies.

Educational theorists such as Gombrich, Lakoff and Deleuze & Guattari have emphasised that modern knowledge operates as a network rather than a hierarchical tree. This creates what Gombrich described as a “pincer movement”: pressure from real-world complexity on one side and from digital, networked learning environments on the other—both forcing education toward interdisciplinary integration

Why Mathematics Matters in Sustainability Education

The United Nations repeatedly stresses that mathematics is indispensable for understanding climate change, from modelling global temperature rise to analysing carbon emissions, biodiversity loss, and energy efficiency. Mathematical literacy enables learners to interpret environmental data and statistics, to understand uncertainty and probability in climate predictions, to critically assess sustainability claims and policies and participate meaningfully in democratic decision-making.

Despite this, mathematics is frequently perceived by pupils as abstract, disconnected, and intimidating—especially among underrepresented groups, including girls. This contributes directly to the shortage of STEM graduates across Europe and to low engagement in mathematics education.

Math4Sustainability addresses this challenge by reframing mathematics as a tool for understanding and transforming the world, rather than as an isolated academic subject.

Math4Sustainability: Interdisciplinary Learning in Action

The Math4Sustainability project is grounded in interdisciplinary and socio-scientific pedagogy, integrating mathematics with environmental education, ethics, technology, and civic engagement.

Rather than traditional instruction, the project employs hands-on mathematical activities connected to sustainability themes, socio-scientific dilemmas that explore ethical and social dimensions of environmental issues and interactive green exhibits that transform abstract mathematical concepts into tangible experiences.

These approaches allow learners to see mathematics at work in real-world sustainability challenges, fostering both conceptual understanding and personal engagement.

The Interdisciplinary Skillset: Preparing Global Citizens

Interdisciplinary sustainability education rests on a shared core of transferable competencies, including quantitative and data literacy, research and inquiry skills, argumentation and communication, collaboration and problem-solving and ethical reflection and civic responsibility

These competencies do not “belong” to a single subject. They form the foundation upon which all disciplines converge, enabling learners to develop what research describes as hybrid learning identities—pupils who ask not “Which subject is this?” but “Which tools do I need to understand this?”

Assessment, Equity, and Educational Transformation

Effective interdisciplinary learning requires equally thoughtful assessment. Drawing on international frameworks such as Boix-Mansilla’s Harvard model, Math4Sustainability promotes assessment based on:

• clarity of problem framing
• appropriateness of methods
• integration of ideas across disciplines
• quality of reasoning and evidence
• reflective thinking

Assessment becomes a learning process, not a bureaucratic endpoint.

Importantly, this approach also supports equity and inclusion. By contextualising mathematics within meaningful, real-world challenges, pupils—particularly those traditionally disengaged from STEM—find relevance, purpose and confidence.

Conclusion: Connecting School with Life

Interdisciplinary education is not a pedagogical luxury. It is the only viable response to the complexity of contemporary global challenges. Sustainability cannot be taught through fragmented knowledge, nor can mathematics remain detached from lived reality.

Math4Sustainability demonstrates how mathematics, when embedded in interdisciplinary sustainability education, becomes a powerful catalyst for critical thinking, civic engagement and environmental responsibility.

As Dewey urged more than a century ago, connecting school with life is not optional—it is essential. In the 21st century, interdisciplinary projects such as Math4Sustainability show us how this vision can become educational practice.

Bibliographical References

• Dewey, J. (1990) The School and Society. University of Chicago Press
• United Nations (2019) Education for Sustainable Development Goals: Learning Objectives. UNESCO
• Boix-Mansilla, V. (2017) Assessing Interdisciplinary Learning. Harvard Graduate School of Education
• British Academy (2021) The Future of Skills and Interdisciplinary Education
• European Commission (2022) STEM Education for Sustainable Development
• Gombrich, E. (1999) The Uses of Images. Phaidon Press
• Lakoff, G., & Johnson, M. (1980) Metaphors We Live By. University of Chicago Press
• Deleuze, G., & Guattari, F. (1987) A Thousand Plateaus. University of Minnesota Press