It deals with to cultural transformations and values, stimulating the adoption of sustainable standards of production and consumption. It also identifies problems, it considers solutions and it esteem investment costs. In the process that lead United Nations to the Conference of on the Environment and the Development? river 92? the approach was adopted as a conceptual landmark that all presided over the process of debates, formulated declarations and documents. The interdependence between the partner-economic development and the transformations in the environment, during ignored decades, entered in such a way in the speech as in the agenda of great part of the governments of the world. The Conference represented a first step of a long process of agreement enters the nations on the concrete measures aiming at ' ' to reconcile the economic activities with the necessity to protect the planet and to assure a sustainable future for all povos' '.

(Report of the Conference of United Nations on the Environment and the Development? river 92). Challenge of the cities for century XXI the question that if places is as to surpass the contradictions and which the reach of alternative proposals in the current world-wide scene, this is the challenge of the cities for Century XXI, that it will be a predominantly urban century, and the Developing countries need to increase its capacities to provide infrastructure, services to keep the current conditions that already are precarious. Few governments make use of necessary resources for a good quality of life, and the result is the proliferation of illegal nestings, populations in growth and an increase of illnesses. The governments will have to formulate the urbanization process, to disencumber the great metropolises, integrating them the provincial cities, decentralizing the administration of the resources. The envolvement of the populations and the communities will be of vital importance for the success of this challenge. What it is observed is that the disequilibrium sped up in the appropriation and use of the resources and the capital ecological, that systematically it favors the center dominant of the economic system, it has the potential force to concentrate the problems of the environment and the development. .