Definition
Sustainability is the principle of meeting the needs of the present without compromising the ability of future generations to meet their own needs. This widely cited definition comes from a 1987 United Nations report on environment and development.
It recognises that human societies depend on natural resources and ecosystems that can be depleted or damaged. Sustainability asks how economies and communities can prosper today while keeping those systems healthy for the long term.
Why it matters
How it works
Sustainability balances three dimensions. The environmental pillar concerns protecting ecosystems, climate, and resources. The economic pillar concerns prosperity and livelihoods. The social pillar concerns fairness, health, and wellbeing. A genuinely sustainable path must satisfy all three at once.
In practice this means shifting toward renewable energy, using materials efficiently, protecting ecosystems, and designing economies that do not depend on consuming resources faster than they regenerate. The aim is a system that can continue indefinitely rather than one that borrows from the future.