Background information, units of study, and bibliographies that teachers can use to introduce students in grades 5-12 to a systematic study of worldwide human populations are provided. The first section discusses world population problems. The author stresses that developed nations must be concerned with rampant human population growth in the developing world and must realize that the chaos, conflicts, and political instability that will result from an unchecked population growth rate and low standards of living in third world countries will have long-term disastrous consequences for all. The second section contains sample units for teaching about the natural and social environments within the context of contemporary problems. Activities deal with population problems, pollution, international economics, international trade, technological development, and the lifestyles of different peoples. Activities are varied and involve students in viewing and discussing media, conducting research studies, role playing, giving reports, and listening to guest speakers. The third section of the guide is an annotated bibliography of print and nonprint materials and human resources. (RM)