In matters relating to the environment, the United Nations Conference on Environment and Development,held in June 1992 in Rio de Janeiro,produced an "Earth Charter" , or declaration of basic principles for the conduct of nations and peoples with respect to environment and development;agreements on specific legal measures,including conventions on climate change and biodiversity, and principles for a framework agreement on forests;and an agenda for action("Agenda 21" ) ,establishing the environmental work program agreed by the international community for the period beyond 1992 and into the twentyfirst century.