At what conferences was agenda 21 developed with enviromental education?

Agenda 21 was developed during the United Nations Conference on Environment and Development (UNCED), also known as the Earth Summit, held in Rio de Janeiro in 1992. It emphasized the importance of environmental education to promote sustainable development. Additionally, the initiative has been reinforced through various follow-up conferences, including the World Summit on Sustainable Development in Johannesburg in 2002 and the United Nations Conference on Sustainable Development (Rio+20) in 2012.