The full text of Agenda 21 was made public at the UN Conference on Environment and Development (Earth Summit), held in Rio de Janeiro on June 13, 1992, where 178 governments voted to adopt the program.
Agenda 21 täielik sisu avaldati ÜRO keskkonna- ja arengukonverentsi (UNCED) poolt 14. juunil 1992 Rio de Janeiro konverentsil, kus programmi kiitsid heaks 179 riigi valitsused.