Pixi books (and their predecessor, Petzi) have been a staple in German children's literature since my parnts were kids (and probably even longer). They are thin and small little books, very affordable, that tell colourful but often very educational stories. This, here, is one of the "maxi" variety (bigger versions).
This book didn't have a story but was rather full of tipps on what to do to enjoy nature, get to know it and learn about it - because you can only protect what you understand. As such, it gave tipps on where to go, what to do, what games one can play and taught the reader about things such as: - climate (mainly explaining CO2) - photosynthesis - how people, plants and animals need one another (though I slightly disagree since I'm convinced the planet would be fine without us) - the role of water (weather cycles) - food (different veggies and how/when they grow naturally but also sustainable animal farming) - garbage - green energy - traffic - what one can do in one's own garden to help nature (especially insects) - climate change
It's one of the books that teach children about the environment and how to protect it in order to protect humanity as well. In my opinion, it did a wonderful job of introducing children to insects (especially bees) and their role in nature as well as a host of other topics. Naturelly, since this is such a slim book, this was only a little appetizer, but presented in such a great way that I'm sure it will make many (young and old) readers look up more about at least soem of the topics mentioned.
I should also mention that it doesn't hurt how cute the illustrations are (here mixed with photographs in this case):