This unit on population is one in a series of three prepared for use in classrooms in North Carolina. An interdisciplinary approach encompassing mathematics, science, and social studies is utilized in these environmental units. The material is designed for middle grades and above. Many activities are open-ended. The depth to which students become involved in the utilization of this unit is determined by factors such as grade level, interest of students, and relevance of the material to courses into which it is integrated. Each activity in this unit emphasizes the population crisis that exists today, not only in faraway locations, but in towns like Fox City, North Carolina. Although the name of the town is fictitious, the statistics about a town of its size are factual. Students study how an increase in population will affect transportation, housing and urban renewal, recreation and municipal services. Task sheets list specific goals for the activities and thought directives instruct the students to proceed in a logical manner. Collections of statistics in the form of fact sheets give valuable information needed by both student and teacher. (JP)