Judy Moody by Megan McDonald is a very good series. It helps you to know about your environment.For example the book JUDY MOODY - SAVES THE WORLD is about how she works really hard to help save the world from the trees being cut down , stopping people from littering the roads and the public gardens etc. She does all this as part of a class project.
At times it's very funny like when a dangerous alien comes on earth and stays at her house as a guest. She also has her own club for missions. The five member club has it's own club mascott toady, their pet frog.