Existing vessels will be able to run on the sustainable fuel methanol if a Danish study bears fruit.
A project supported by the Danish Energy Agency aims to develop a retrofit solution to make many ships fossil fuel-free.
Other biofuels could be included in the scheme, which is being led by the Danish Technological Institute.
"Methanol does not 'soot', has very low particle formation and can be produced CO2-neutral by, inter alia, biogas or wood," said the institute's senior specialist, Kim Winther.
