Assess students' ability to apply life cycle assessment (LCA) to compare environmental impacts of single‑use versus reusable coffee cups: define a clear functional unit and system boundaries, construct a life cycle inventory (materials, manufacture, transport, use-phase washing, and end‑of‑life), select relevant impact categories (e.g., GWP, energy, water, waste), perform allocation and sensitivity (number‑of‑uses) analyses, interpret trade‑offs and uncertainty, and make evidence‑based recommendations for consumers or policy. Scope: undergraduate, cradle‑to‑grave scenarios with quantitative and qualitative evaluation.