ABSTRACT
Strategies of sustainable development, like any other action program, require rational thought. However, the recommendations such strategies include often concentrate only on technical parameters of the environment and on economic conditions, which, although important, do not provide a complete answer to the fundamental question: why should we behave in one way and not in another? This is because the discussion within them mainly regards levels II and III of sustainable development. There is still level I, however, which consists of philosophy-a discipline which, in its long history, has very frequently asked the question: why? (Graaf et al., 1996).
