Abstract. Studies and researches on the deterioration of the ecosystems and the environmental services provided by the natural ecosystems have been undertaken and are under way even to this day on very many levels, some even in areas or domains having no connection with ecology or with the environment. The profound ecology demonstrates unequivocally that the natural and semi-natural ecological ecosystems produce resources and services, through the concentration of the solar radiant energy and trough the maximization of the density of the energy flow. The primordial task the research have is the creation of a vision as widely accepted as possible on a sustainable society in the long run.

Keywords: ecosystem, natural capital, sustainable development, socio-economic system, sustainable economy.