At the beginning of the last decade of the last century representatives of one hundred seventy nine countries gathered in Rio de Janeiro, where was reached an agreement on the need for joint actions within the paradigm of sustainable development. As defined by the World Commission on Environment and Development, the sustainable development is "mankind’s satisfaction guarantee of the present needs without damaging the ability of future generations to meet their own needs» (WCED. Our common future, 1987, p. 32). Resulting document of the World Forum, under the aegis of the United Nations, called "Agenda 21." The international Continue reading...