Segment from the anthology film 'Interdependence' (2019). 80-year-old Olmo looks out of the window of a building in the suburban area of a city. His eight-year-old grandson Giulio is reading him an article from the newspaper about melting glaciers, the greenhouse effect, methane and CO2. “What is C-O-2?” asks the child. “Do you remember the carbon dioxide we studied?” says grandpa. “The one the trees breathe?” asks Giulio. The day after, they’re leaving for a short tour instead of going to school, searching for an old tree.