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In this kinesthetic activity, students take on roles of either photons or gas molecules. Photons signal a change from visible light to infrared with a piece of folded construction paper, simulating absorption by the Earth's surface and reradiation to space. The play is guided by flipping a coin, and students see how stochastic processes result in 70% of visible protons being absorbed and reradiated as infrared. This activity is supported by a textbook chapter, What is the Greenhouse Effect?, part of the unit, Climate Change, in Global Systems Science (GSS), an interdisciplinary course for high school students that emphasizes how scientists from a wide variety of fields work together to understand significant problems of global impact.