"Once upon a time..." is a children's book that addresses a variety of critical environmental issues. It has been specifically designed for young readers, making complex topics understandable and engaging. The combination of informative texts and numerous images enhances comprehension and stimulates the imagination. This book is ideal for children and teenagers who are interested in the environment and want to learn more about important ecological topics. Its appealing design and child-friendly language make it a valuable companion for early engagement with environmental issues.