Climate change regulation, being imbued with multiscalar complexities, economic concerns, and numerous constitutional implications, presents a rich pedagogical context for teaching business regulation. However, environmental law, as an instructional topic, can be quite complex and daunting to present to students. The topic presents issues of international scale and is often rife with complex scientific debate and solutions. The class assignments presented in this article seek to diffuse the complexity by offering a combination of interactive, web-based activities and reflective, written assignments intended to incrementally advance students through the study of climate change regulation. Through these assignments, students will improve their understanding of the underlying national and international debate, federal and state regulatory tensions, and predicted harms and proposed solutions. The article presents a case study that begins with an interactive, web-based activity that explores public opinion regarding scientific claims and proper regulatory responses to climate change. Part II addresses the complexities of climate change regulation. Part III continues by offering an overview of climate change policymaking efforts at the global, national, and state levels, providing context for both the U.N. negotiation assignment and the incentive for national Clean Air Act (CAA) citizen suits. Part IV examines the citizen suit provisions of the CAA, explaining the legislative purpose for granting citizens a regulatory role in monitoring agency action and polluter violations. This part also provides a straightforward explanation of the types of citizen suit defendants, claims and remedies, in a format easily adaptable for class lecture. Part V proceeds to a discussion of the Supreme Court's ruling in Massachusetts. Part VI describes the teaching assignments, and the conclusion is presented in Part VII.