9Wendy and Sarah were preparing to go to school when they got into a tiff in the bathroom. What did they disagree about? And why did it matter? Follow Wendy and Sarah as they explore how one little action from them could make a huge difference to the sustainability of our world.Every book in the I Can Change the World... collection contains a creative story that highlights the importance of individual action on environmental sustainability. Through engaging narratives and full-colour illustrations, the I'm a Little Scientist series introduces children to the exciting and ever-advancing world of science.