What is energy and why should we save it? This book introduces readers to different kinds of energy and how they power many things that we use every day. Readers will learn the problems that come along with using too much energy, and how they can take steps to reduce their energy use. They'll discover how simple actions like turning off the lights when you leave a room or closing the refrigerator can make a big difference. Facts are presented through sidebars, fact boxes, and graphics to give eco experts the knowledge they need to save the planet.