In 'The 3Rs Challenge: Mission Earth', students are tasked with understanding waste management through the lens of reduction, reuse, and recycling (the 3Rs). The objective is to categorize various waste items based on their potential for the 3Rs and to justify how these choices can lessen environmental impact. The resource emphasizes the importance of changing waste habits, as evidenced in the film 'Wall-E', where Earth faces dire consequences due to excessive consumerism. Throughout the challenge, students will engage in structured team activities that promote critical thinking and accountability, while also addressing the differences between linear and circular economies. The activity culminates with a metacognitive reflection on their categorization decisions and group dynamics, along with a challenge task that motivates students to propose actionable strategies for waste reduction on campus.