246g of CO2 per passenger kilometer [0]. Versus 35g for national rail [0]: https://ourworldindata.org/travel-carbon-footprint https://ourworldindata.org/travel

246g of CO2 per passenger kilometer [0]. Versus 35g for national rail [0]: https://ourworldindata.org/travel-carbon-footprint https://ourworldindata.org/travel-carbon-footprint