What age-group is this book aimed at?

There are three parts to this book, each having appeal to a slightly different age group, which extends its lifespan for its intended audience. The story book part is written with 4-8 year olds in mind. The science part of the book can be read to a child of any age, but its concepts and world-view perspective are better suited to children 6+. The action plan poster is for everyone, including adults. Every member of the family can get something useful from this book.