DK 
DK Super Readers Level 4 Save Energy, Save Earth 

Use your reading superpowers to learn all about how we could help Earth by saving energy — a high-quality, fun, non-fiction reader — carefully levelled to help children progress.
Save Energy, Save Earth is a beautifully designed reader all about where energy comes from and how we can use it more carefully — you will never leave a light on again!
The engaging text has been carefully levelled using Lexiles so that children are set up to succeed.
A motivating introduction to using essential non-fiction reading skills.
Children will love to find out about what energy is and how they can change how they use it to help save Earth.