This is one of a series of units for environmental education developed by the Highline Public Schools. The unit is designed for junior high school mathematics classes and emphasizes applications of exponents to problems of population growth and pollution. The nine lessons are designed for about eleven school days. Each lesson includes the concept of the lesson, materials needed, procedure, evaluation activities, and suggested extra activities. The materials were tried and evaluated; evaluation data may be obtained from the Highline Public Schools. (RH)