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IB DP ESS — Topic 1: Foundations | SL & HL | Paper 1 & Paper 2
🎯 Learning Intentions By the end of this note, you will be able to:
- Define sustainability and sustainable development using IB-aligned ESS terminology, including the Brundtland Commission definition.
- Explain the three pillars of sustainability — environmental, economic, and social — and describe how they interact within human-environment systems.
- Describe the concept of the triple bottom line and its application in evaluating development decisions at local, national, and global scales.
- Analyse the tensions and trade-offs between the three pillars of sustainability using real-world case studies, applying ESS analysis parameters including scale, perspectives, and sustainability.
- Evaluate the effectiveness of the United Nations Sustainable Development Goals (SDGs) as a framework for achieving sustainable development globally.
- Discuss contrasting worldviews — ecocentric, anthropocentric, and technocentric — in relation to sustainability and how these shape different approaches to development.
- Distinguish between weak sustainability and strong sustainability, and explain the implications of each for environmental management.
Real-World Context & Relevance
In 2018, the Intergovernmental Panel on Climate Change (IPCC) issued a landmark Special Report warning that the world had approximately 12 years to limit global warming to 1.5°C above pre-industrial levels — a threshold beyond which the risks of drought, floods, extreme heat, and poverty for hundreds of millions of people would escalate dramatically. At the same time, the World Bank estimated that over 700 million people were still living in extreme poverty, surviving on less than $2.15 per day. These two crises — ecological breakdown and persistent human deprivation — are not separate problems. They are symptoms of the same underlying challenge: how do human societies develop and improve well-being without destroying the environmental systems that make all life possible?
Consider the Aral Sea in Central Asia — once the world's fourth-largest lake, it has shrunk to less than 10% of its original size since the 1960s, largely due to Soviet-era irrigation projects that diverted its feeder rivers to grow cotton in the desert. The economic gains from cotton production were real and significant for decades. But the ecological collapse that followed — the disappearance of the fishing industry, the spread of toxic salt dust, the desertification of surrounding land, and the public health crisis affecting local communities — illustrates with devastating clarity what happens when economic development proceeds without regard for environmental or social limits. This is the central problem that sustainability, as a concept and a practice, attempts to solve.
🌍 Why This Matters Sustainability is not an abstract philosophical ideal — it is the organising framework for virtually every major environmental policy decision made today, from national energy strategies to international climate agreements. Understanding the pillars of sustainability and the tensions between them is essential for analysing any real-world environmental issue in ESS, and for evaluating whether proposed solutions are genuinely durable or merely short-term fixes.
Core Concepts & Definitions
Before we can evaluate whether any development project, policy, or technology is truly sustainable, we need a working definition of what sustainability actually means. The word is used so frequently — in advertising, politics, and everyday conversation — that it risks becoming meaningless. In ESS, we use a precise, internationally agreed definition that emerged from decades of environmental and development thinking.
📖 Key Definition — Sustainability Sustainability is the capacity of a system to maintain its essential functions, processes, and biodiversity indefinitely, without degrading the ecological, social, or economic conditions upon which it depends. In the context of human societies, sustainability refers to the ability to meet present needs without