The sustainable development is a concept which appeared gradually after the second world war, at first, in the mind of conscious visionaries who conclued that the Earth had finished dimensions and by the way limited resources and secondly, because the world economic and demographic growth of the XXth century came along with new problems: depletion of natural ressources, global warming, desertification, chemical accidents, tankers, escalation of the inequality between developed countries and developing country.

This awareness gradually spread in the scientific, economic and political world to be finally the object of an important study organized by the UNO at the beginning of 1980s.

The sustainable development is a " mode of development allowing to meet the needs of present generations without compromising the capacity of the future generations to answer in theirs ".

This mode of development has to allow a balance between the economic growth, the social equality, the environmental protection and the participation of the citizen.

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