Abstract: An interactive classroom game for enhancing student understanding of pollution control strategies is presented. The game focuses on the dramatic differences in compliance costs that can occur between three principal control approaches: emission limits, emission permits, and emission taxes. Students assume the role of industrial managers and attempt to minimize their control costs using various control strategies, two of which involve a simulated permits auction. The game can be adapted for use at the high school, undergraduate, or graduate level in courses in environmental science, environmental management, or economics.