When we are out and about, it happens again and again: one of the children finds an empty can, the remains of a plastic bag or broken glass in the grass, on the forest floor or on the side of the path. “But that’s dangerous for the animals!” says Leon indignantly. He and the others can’t understand why people just throw their trash into the environment instead of taking it back home. “Or in the bins, there’s plenty there,” Ayla…