Gdzie szukać odnawialnych i nieszkodliwych dla środowiska źródeł energii? Odpowiedź jest prosta: spróbujmy termin ,,zielona energetyka" zrozumieć dosłownie.

In the 9th-11th centuries, Poland was characterized by a process whereby Slavic society was adapted into a civilization founded on Mediterranean culture, resulting in the emergence of a new, open society. Two kinds of social bonds came to coexist: on the one hand there were tribal community bonds founded mainly on territorial and family unity, while on the other there were new bonds based upon the institutions of the state.