The book "Negative Population Growth" by Betascript Publishing provides a comprehensive analysis of the organization Negative Population Growth (NPG), which was founded in 1972 in the United States. The organization addresses the challenges of overpopulation and advocates for a gradual reduction of the population both in the U.S. and worldwide. NPG believes that the optimal population size for the U.S. is between 150 and 200 million and for the world population between two and three billion. To achieve these goals, the organization promotes various policy measures aimed at reducing the birth rate in the U.S. to 1.5 births per woman and limiting immigration to 100,000 to 200,000 people per year. The book offers valuable insights into the arguments and strategies of NPG as well as the social and political implications of their proposals.