This is the first book that shows the spread of light pollution on our planet. It is the result of years of research by the author and his collaborators. The book contains full color plates of the continents and of the main countries, showing the brightness of the night sky at zenith due to light pollution. It can help to choose the best places for stargazing or the nearest site to admire the Milky Way. It will show how polluted is the place where you live. The book also describe how to reduce light pollution and its negative consequences on economy, environment and human health. Beside all this, the spectacular plates it presents are a call to action to preserve the last naturally dark places on our planet and to restore the night as it has been for billion years.