How can trekking be made even more environmentally sustainable? You will find the answer in this film-documentary, in which a journalist, an expert in travel and mountaineering, walks the 7000 km of the “Sentiero Italia Cai”, a trek that unites the whole of Italy, passing through the Alps and the Apennines. To do this, the protagonist uses his legs and the public transport that connects the big cities to the trailheads every day.