Riccardo Lattanzi, Giorgio Einaudi, Tony Volpe and Federico Casalegno, guests at Casa Italiana Zerilli-Marimò to discuss a few important topics: the Copenhagen conference on climate change, future scenarios and current projects. The four Italian scientists, experts on environment and new technologies, held a seminar in the building's auditorium to speak about environmental sustainability and renewable energy. Many original and interesting ideas resulted.