The United Nations Conference on Environment and Development (UNCED), to be held in Rio de Janeiro this June, will be the world’s most comprehensive organized response to international environmental degradation. UNCED delegates will seek to adopt conventions on greenhouse gases and biodiversity; to enunciate in an “Earth Charter” the principles by which humans should conduct themselves in relation to the environment; to adopt a program of action, called Agenda 21, to implement the Earth Charter; and to develop a set of institutional and financial arrangements to support such measures.