With the cost of fuel spiralling out of control, the world's largest cruise group - the Carnival Corporation - is set to introduce a new range of efficiency measures aimed at cutting costs and saving energy.
Senior executives from the group, which operates a number of ships across brands including Costa
, have suggested efficiency boosting measures such as turning off lights and harnessing waste heat, TravelMole reports.
The Carnival Corporation predicted earlier this year that due to the soaring price of oil, its fuel costs would rise by around $752 million during 2008.
Other energy saving measures suggested by cruise bosses include painting ships with a special varnish to enable them to glide more easily and making changes to the trim of liners.
The number of Britons opting to take cruise holidays has more than doubled over the last decade, according to a report by the Guardian last year.