Road transport accounts for about one fifth of the EU’s total emissions of CO2 (cars and vans 15%, heavy duty vehicles 6%). While shipping is in most cases more fuel-efficient than other transport modes, its GHG emissions are growing fast. International shipping accounts for 4% of the EU’s GHG emissions. Aviation accounts for about 3% of the EU’s total GHG emissions, with the largest part coming from international flights. The least polluting mode of transport, rail accounts for less than 1% of transport CO2 emissions.