When Miss Fox shows up at school riding her bicycle, Mouse asks, Do you have a flat tire? No, Miss Fox tells her students. I am going green Soon everyone in the class is working to keep the earth healthy. Mouse takes shorter showers (and does her singing after ); Bunny brings a cloth bag to the supermarket; and Possum turns the lights off when he goes out. And Miss Foxs simple act has ripples even beyond her own students...soon the whole school starts riding their bikes--including the principal.