Review with students the sections of this book that discuss light pollution. Go over what it is, its sources and how it affects the appearance of the night sky, our environment, and our own health and well-being. Illustrate your points by showing students an image of the earth at night and the sources of light pollution from different cities. Working with an adult at home, have students go outside at night to observe and record the light pollution they see and how it affects the appearance of the sky. Come together as a class and discuss their findings. How does light pollution differ from location to location? What causes the light pollution that students have recorded — nearby cities, shopping centres, streetlights? How could this light pollution be limited or eliminated?
Note: Images, information and statistics are available from The International Dark Sky Organization (http://www.darksky.org)