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Emission factors used: Car (petrol) 0.192 kg CO₂/km per vehicle shared by travellers; Train 0.041 kg/passenger‑km; Plane (short‑haul) 0.200 kg/passenger‑km; Coach 0.027 kg/passenger‑km; Electric car based on 295 g/kWh average grid mix.

Sources: DEFRA, EEA, ICAO methodology. For a complete breakdown, upgrade to Premium.