The book first talks about the shape of our planet (hence the title) and relates it to our actual houses. Then the book does into great detail (while still keeping it simple) as to how we can help our Earth and keep her clean. The book gives specific examples on what we can do everyday to help out our planet. From recycling, to unplugging things we are not using them, to picking up trash, every little bit helps.
I highly recommend this book for little ones and their families. It's a great book for the entire family, and can start great discussion.