The document discusses several issues related to rapid urbanization and the growth of slums in developing countries. It notes that the world's population is increasingly urbanizing, with over 400 cities now home to over 1 million people each. As a result, slums are growing dramatically and most people in the least developed countries now live in slums. These slums pose major health risks such as exposure to toxins and traffic accidents, and children in particular face exploitation through child labor.