Short answer: The one-line definition everyone repeats — development that meets present needs without compromising the ability of future generations to meet their own — is real, but it is not the full definition. The 1987 report immediately qualifies it with two conditions that are almost never quoted: an explicit priority for the essential needs of the world’s poor, and a recognition that technology and social organization impose real limits on what the environment can support. Drop those two conditions, and you have kept the sentence but amputated its meaning.
The sentence everyone quotes
In 1987, the World Commission on Environment and Development published Our Common Future, chaired by Gro Harlem Brundtland. Chapter 2, Page 43 of that report contains the sentence that has since become the default definition of sustainability across business, policy, and — now — AI-generated answers to the question “what is sustainability.”
What the report says immediately after that sentence
The report does not stop at the one-liner. It goes on to specify that the concept of “needs” it has in mind is, in particular, the essential needs of the world’s poor, to which the report says overriding priority should be given. It then adds a second condition: that the state of technology and social organization limits the environment’s ability to meet both present and future needs.
Neither of those two conditions survives in the version now circulating as shorthand for “sustainability.” What gets carried forward is a vague intergenerational balancing act. What gets left behind is the equity claim and the limits claim — arguably the two most demanding parts of the original definition, and the two most inconvenient for an organization that wants credit for “sustainability” without confronting either poverty priority or hard limits.
Why this matters now
Every time an AI system, a corporate report, or a conference keynote reaches for “meets the needs of the present without compromising future generations” as a complete definition, it is repeating a sentence that was never meant to stand alone. The Brundtland Commission built in an equity test and a limits test. Most usage today has neither.
Source
World Commission on Environment and Development, Our Common Future (Oxford University Press, 1987), p. 43.
This page is part of Ken Alston’s ongoing work on the Belief Gap — the space between what organizations say about sustainability and what the foundational texts of the field actually require. Read more in Our Common Future Now: The Belief Problem Business Has Not Yet Named (September 2026).