Some of the scientific questions and basic methodological regulations, which follow from the practice of using "meta knowledge" of geoecology obtained in the process of research and working out of the National Concept of Sustainable Development of Russia (NCSD), as the official doctrine of its development (1996), presented for discussion. The aim of the study is determination of a special (physically adequate to Nature and Society), information, logical and algorithmically organized sub domain of natural scientific knowledge necessary for a comprehensive idea of the original object of the study: active complicated systems (ACS) of "nature-society" class. The main trend of application of the results obtained is elaboration of automated ("human-machine") systems for planning (support) of optimal management decisions for organizational structures of environmental management at the global, regional and local levels of the planet. A new – "geosystem" – approach to solving the problems of sustainable development ("Sustainable Development", 1995), including the possibility of both external ("technogenic") and internal (or "soft", i.e. restoring the ecological balance) management of the ACS "nature-society" is proposed.
