Question: When did the concept of sustainable development come into existence?
Disambiguated questions and answers: question: When is it widely accepted that the modern concept of sustainable development came into existence?
When did the concept of sustainable development come into existence marked by the IUCN publishing its World Conservation Strategy referencing sustainable development as a priority?
When did the concept of sustainable development come into existence marked by an MIT group presenting the first ever hearings on sustainable development?
answer: 1987
October 1987
1980
1973
Natural Questions answer: 1987 (from the Wikipedia article "Sustainable development")