Cumbre de la Tierra
There have been 4 environmental mega conferences to date; United Nations (UN) Conference on the Human Environment (UNCHE) 1972 (commonly known as the Stockholm conference); UN Conference on Environment and Development (UNCED) 1992 (also known as Rio Conference or Earth Summit); UN General Assembly Special Session on Sustainable Development in New York 1997 (Earth Summit II) and World Summit on Sustainable Development (WSSD) 2002 in Johannesburg.