The e-book "Once Upon a Time..." offers young readers an engaging introduction to a variety of important environmental issues. The content is scientifically based but presented in a way that is understandable for children. A variety of images complement the text, making it easier to grasp complex topics. This book not only raises awareness of ecological issues but also encourages discussion and reflection. It is ideal for children and teenagers who are interested in the environment and want to learn more about the challenges our planet faces.