Assess students' ability to calculate and compare the carbon footprints of multiple commuting options for a specified daily route. Given route distance and parameters (vehicle fuel efficiency and occupancy, transit average occupancy, electric vehicle/e-bike electricity use with local grid emission factor), have learners compute per-trip and annual emissions, compare modes (solo car, carpool, bus, train, e-bike, bicycle, walking), interpret results, and recommend lower‑emission choices and relevant trade‑offs.