Light and dark have affected the very ways humans, plants, and animals have grown and thrived. In fact, light and dark have affected pretty much the entire natural world around us. But lights from cars, streetlights, houses, shopping malls, skyscrapers, and other structures make towns and cities glow with light so bright it can be seen from outer space. What happens when humans tamper with the age-old balance of day and night? Told through the eyes of thirteen-year-old Joan who loves the outdoors, Dark Matters introduces young readers to the fragile animals that are impacted by our increasingly threatened nighttime skies. Come discover the amazing night life of frogs and bats, turtles and fireflies, birds, plants, and so much more. And learn how their lives and ecosystems are negatively impacted by light-much of which is so unnecessary. This book is packed full with fascinating and unexpected facts and illustrations, and comes with tips and suggestions on how young people can help reduce light pollution.