Sustainable is a word that qualifies the non Development, is not quantifiable The concept proposed by the UN, by its specific forums, and later by the Conference of Rio de Janeiro (Rio-92), is considered one of the concepts, but not the only one. The World Commission on Environment and Development, created in 1983, emphasizes that "Sustainable development is the one that meets the needs of the present without compromising the ability of future generations to meet their own needs".
The concept of sustainable development for environmentalists is an old aspiration to determine their needs and priorities of the new society, a new ethical of human behavior and a restoration of the primacy of social interests, collective.
The environmentalists' position is seen as a change of the production and consumption in the context of reversing caused environmental degradation and social misery. This concept of environmental degradation would be adulterated as it is interpreted by different social actors, to be perceived either as a port of entry for international mechanisms of control over our natural time as a strategy of expansion and market profit.
An ecologically sustainable society is one that:
a) Conserves biodiversity and life support systems;
b) Ensures that the use of renewable resources is sustainable and that the degradation of non-renewable resources is minimized;
c) Seeks to remain within the capacity of supporting ecosystems.
In 1972 the Club of Rome entitled "Limits to Growth" focuses on examining how the development and retain their destruction to the environment.
There is no development in itself, but a society that opts for development that you need and want. If a company is sustainable, by definition, it is said that a sustainable society where to the satisfaction of their needs, without compromising the natural capital and without prejudicing the right of future generations to see also met their needs and they can inherit a planet healthy ecosystems with their preserved.
This, suggests that the sustainable society produce enough for themselves and for the beings of the ecosystems where it is, taking only what nature can replace it, and that in practice the company must show itself capable of assuming new habits and design a type of development that the growing attention to the ecological balance and function within the limits imposed by nature.
The obsolescence must be contained, not necessarily preventing the consumption but the irresponsible consumption.
To be sustainable, development must take into account social and ecological factor, as well as economic, the bases of living resources and non-living, the benefits of alternative actions, I the long and short term. The development is an economic, social, cultural and political comprehensive task, aimed to consistently improve the welfare of the whole population and every person on the basis of their active participation, free and meaningful and fair distribution of benefits from it.
From a more practical way one can say that the social development aims to improve the quality of human life as human, this includes long and healthy life, education, political participation, …