- "Development that meets the needs of the present without compromising the ability of future generations to meet their own needs"
The Brundtland Report, 1987
- "A dynamic process which enables all people to realise their potential and improve their quality of life in ways which simultaneously protect and enhance the Earth's life support systems"
Forum for the Future
- "Sustainability is what we want it to be and can change as we change. (...) The best we can achieve is to acknowledge the centrality of people and to put participation at the very heart of implementation."
Bell and Morse, 2000