London, Sept 18: Particles found in smoke plumes produced by cargo ships has a surprising cooling effect on the Earth's atmosphere, a new study by a team of German researchers from the University of Bremen, has revealed.
Shipping fuel is less refined than aeroplane fuel and contains more sulphur. As a result, tiny particles of sulphur dioxide contained in ship exhaust fumes create cloud tracks – similar to plane contrails – in the sky above a travelling vessel.