Wrapping up the Shaping the Future of Shipping conference, International Maritime Organization secretary general Kitack Lim said he felt the pressure for the UN body to upgrade its ambitions for shipping to decarbonise.

His comments at the conference hosted by the International Chamber of Shipping came as COP26 negotiations geared up for transport discussions on Wednesday.

"We must upgrade our ambition, keeping up with the latest developments in the global community," Lim said.

"The calls for action by world leaders, both from government and business, are loud and clear in the past week at COP26.