Assess students' ability to apply life-cycle assessment methods to calculate and compare greenhouse gas emissions (g CO2e/km and kg CO2e/year per person) for four options—private petrol car, city bus, bicycle, and electric scooter—for a 10 km daily commute (round-trip). Provide emission factors for life-cycle stages (manufacturing, energy/fuel production and use, maintenance, end-of-life) and assumptions for occupancy and electricity grid mix; students will compute per-trip and annual emissions, compare per-passenger impacts, interpret trade-offs, and perform a simple sensitivity analysis on key parameters (vehicle lifespan, occupancy, battery production assumptions).