Twenty more maritime companies have pledged to keep shipping in Singapore clean and green.
They signed the Maritime Singapore Green Pledge on Tuesday to signal that intent.
The companies include Maersk Tankers Singapore Pte Ltd, Oil Spill Response Ltd, PSA Marine Pte Ltd and Singapore Cruise Centre Pte Ltd.
They join 40 other companies which have already signed the green pledge.
In a statement on Tuesday, the Maritime and Port Authority (MPA) of Singapore said the pledge signing was witnessed by its Chief Executive Lam Yi Young.
It added that the Maritime Singapore Green Pledge was launched in 2011 as part of the Maritime Singapore Green Initiative.
The Maritime Singapore Green Initiative comprises three programmes - Green Ship Programme, Green Port Programme and Green Technology Programme.
MPA said as at end-November 2013, 96 Singapore-flagged ships have been recognised as Green Ships under the Green Ship Programme.
More than 1,900 vessel calls have been given port dues concessions under the Green Port Programme.
Co-funding of S$12 million has been approved under the Green Technology Programme, added the statement.