Sustainability Discussion Articles 60 © 2007 ecomed publishers (Verlagsgruppe Hüthig Jehle Rehm GmbH), D-86899 Landsberg and Tokyo • Mumbai • Seoul • Melbourne • Paris Env Sci Pollut Res 14 14 14 14 14 (1) 60 – 66 (2007) Discussion Articles Reclaiming the Definition of Sustainability Paul Johnston 1* , Mark Everard 2 , David Santillo 1* and Karl-Henrik Robèrt 3 1 Greenpeace Research Laboratories, Department of Biological Sciences, University of Exeter, Exeter EX4 4PS, UK 2 Visiting Research Fellow, Faculty of Applied Sciences, University of the West of England, Coldharbour Lane, Frenchay Campus, Bristol BS16 1QY, UK 3 Physical Resource Theory, Chalmers University of Technology and Göteborg University, 41296, Göteborg, Sweden * Corresponding authors ( P .Johnston@exeter .ac.uk; D.Santillo@exeter .ac.uk) Introduction The idea of 'sustainable development' was first widely ar- ticulated in 1987's Brundtland Report (World Commission on Environment and Development) from the United Nations. The 'Brundtland definition' of sustainable development was framed as "…development that meets the needs of the present without compromising the ability of future generations to meet their own needs". It posits that the only truly sustain- able form of progress is that which simultaneously addresses the interlinked aspects of economy, environment and social well-being. In the subsequent two years, around 140 alternative and variously-modified definitions of 'sustainable development' emerged. Currently, it has been estimated that some three hundred definitions of 'sustainability' and 'sustainable de- velopment' exist broadly within the domain of environmen- tal management and the associated disciplines which link with it, either directly or indirectly. A framework to guide human development requires the tight integration of several distinct, yet associated elements. The tight linkage of sustainability concepts to ongoing economic and technical activities, as opposed to traditionally defined 'economic growth', is essential in framing the constraints and new opportunities of subsequent social and commer- cial development. This does imply changes in direction rather than perpetuation of the old economic model with all of its vested interests, though this is as much an oppor- tunity as a threat, as new markets are created for which new technologies and products will be essential. However, the realisation of this ideal is sadly lacking. Unfortunately, the proliferation of alternative definitions of 'sustainability', which flowed throughout the 1990s, has created a situation where a concept which is central to environmental issues, and solutions to them, has come to mean many things to many constituencies. Simply, 'sustainable development' is now a term which is increasingly regarded either as internally self-contradictory (an oxymoron) or, at best, plagued by ambiguous or dis- torted definitions. As a result, there are many constituencies which perceive the term 'sustainable development' as a ve- hicle to perpetuate many and varied corporate and institu- tional interests whilst giving the impression of adherence to, and observance of, environmentally-sound principles. This DOI: http://dx.doi.org/10.1065/espr2007.01.375 Abstract Background and Scope. Since its inception two decades ago, the concept of sustainable development has suffered from a prolif- eration of definitions, such that it has increasingly come to mean many things to many different people. This has limited its cred- ibility, called into question its practical application and the sig- nificance of associated achievements and, overall, limited the progress in environmental and social developments which it was designed to underpin. Goal. This viewpoint article is intended to re-open the concept of sustainable development for discussion 20 years on from the Brundtland Report, in the context of the current state of the world, our growing understanding of ecosystems and their re- sponse to stressors and the parallel increase in recognition of inherent limitations to that understanding. Approach. Following a brief review of the diverse manner in which the concept has developed over time, we present the case for application of a series of simple conditions for sustainability, originally developed by The Natural Step in the early 90s, which nevertheless still provide a sound basis on which progress to- wards sustainable development could be monitored. The paper also highlights the unavoidable links between sustainability and ethics, including those in the sensitive fields of population and quality of life. Discussion. Overall we argue the need for the concept of sus- tainable development to be reclaimed from the plethora of eco- nomically-focused or somewhat vague and un-measurable defi- nitions which have found increasing favour in recent years and which all too often accompany relatively minor progress against 'business as usual'. Recommendations and Perspectives. The vision encapsulated in the Brundtland Report was ground-breaking. If, however, true sustainability in human interactions with the biosphere is to be realised, a far stronger and more empirical interpretation of the original intent is urgently required. To be effective, such an in- terpretation must encompass and guide developments in politi- cal instruments and public policy as well as corporate decision- making, and must focus increasingly on addressing the root causes of major threats to sustainability rather than just their consequences. Keywords: Ecosystems; ethical standards; over-exploitation; pollution; public policy; resources; sustainability; sustainable development; uncertainty