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LNG is a fossil fuel whose use is not consistent with the Paris Agreement 1.5C temperature goal. It consists primarily of methane, an extremely powerful greenhouse gas (GHG), which has climate impacts over 80 times greater than carbon dioxide over a 20-year period. Methane leaks into the atmosphere across the full production lifecycle of LNG, and once on the ships, the unburned gas escapes from the smokestacks into the air.
Despite the devastating frontloaded climate impact of methane, to date policymakers have been slow to address its use in regulation, and public awareness of the issue is low. This gives cruise companies the latitude to invest in LNG as an alternative fuel – and they have done so with gusto.
Why do cruise companies love LNG?
There are some benefits to LNG on paper: in the short term it reduces air pollution and CO2 emissions when burned, compared to standard shipping fuel. This has led to some of the world’s biggest cruise companies (including Carnival Corporation & plc and MSC Cruises and Royal Caribbean Group) to portray their cruises as sustainable, and their newest ships “clean”, “green” and “eco-friendly”.
Across the industry, company webpages are littered with references to LNG superimposed on images of idyllic blue seas, thriving coral reefs, and green forests. Most of us aren’t specialists in the climate impacts of differing fuel compositions, and it’s easy to be taken in.
But the reality is that these adverts are a very effective smokescreen for the fact that the true climate effect of LNG is likely worse than if the companies had stuck with dirty heavy marine fuel oil.
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