In this lesson students use a straightforward, manipulative model to understand how anthropogenic carbon is increasing carbon in the atmosphere, which is the driving force of global warming. This model focuses on the global carbon cycle and tracks how carbon moves from anthropogenic sources (human caused) to the atmosphere and then to the oceans and land. Students will test the model and then be able to hypothesize how different amounts of anthropogenic carbon will affect the amount of carbon in the atmosphere over time.