The three pillars of sustainability are environmental sustainability, social sustainability, and economic sustainability. A practice is fully sustainable only when it supports the long-term viability of the socio-ecological system across all three dimensions.
This is core SL and HL content in IB ESS subtopic 1.3 Sustainability. Sustainability means maintaining socio-ecological systems without diminishing the conditions available to future generations.
| Pillar | Meaning in IB ESS | Example indicators |
|---|---|---|
| Environmental | Using and managing natural resources so they can be replaced, while allowing ecosystems to recover and regenerate. | Biodiversity, pollution levels, carbon footprint, water footprint and resource use |
| Social | Creating structures and systems that support human well-being, including health, education, equity and community. | Access to clean water, food security, health outcomes and educational access |
| Economic | Creating economic structures that can continue producing and distributing goods and services to meet future human needs. | Employment, reliable income, affordability and long-term financial viability |
The pillars are interdependent. For example, a hydroelectric dam may provide low-carbon electricity and employment, supporting environmental and economic goals. However, if it floods ecosystems or displaces Indigenous and local communities without fair consultation or compensation, it weakens environmental and social sustainability.
This connection also introduces environmental justice: all people should have equitable access to natural resources and a pollution-free environment, regardless of characteristics such as income, nationality, race or gender. Different perspectives may prioritize the pillars differently. A technocentric stakeholder may emphasize engineering and economic growth, while an ecocentric stakeholder may prioritize ecosystem integrity.
A common misconception is that sustainability means only protecting the environment. In ESS, environmental protection alone is insufficient if a strategy creates severe inequality or cannot remain economically viable.
Exam technique: For an “explain” question, define each pillar and show how they interact through a specific example. For “evaluate” or “discuss,” consider benefits and limitations across all three pillars, include stakeholder perspectives, and reach a supported conclusion.
