Summary:

The conception of sustainable development is relatively new but the literature on the subject is already imposing. The idea is essentially greatly complex and has numerous aspects. Perhaps it is the reason why it is differently understood and interpreted. Therefore it is necessary to re-define it, considering constantly changing external and internal conditionings. At the turn of the 20^th and 21^st century the concept was commonly considered as basic (e.g. in the EU countries) and its theory has been well documented but practical applications were but few. No experiences have been gained either (see : part 1). In Poland the idea has even been included in the Constitution of the Republic of Poland (par.5). Unfortunately practice shows that it has not been implemented in the Poland, on the contrary solutions opposite to this conception are realized with all the consequences for contemporary and future generations (see: part 2).