LNG Lobbying Is Quietly Reshaping the IMO's Decarbonization Talks

The ships that carry the world's goods run on some of the dirtiest fuel on earth, and for years the International Maritime Organization has been inching toward a framework that might change that. But inside those negotiations, something else has been happening: a quiet, sustained effort to keep liquefied natural gas in the picture as a long-term marine fuel, even as scientists and climate advocates argue it offers little more than a detour on the road to zero emissions.

Observers tracking the IMO talks say the pressure appears to be concentrated among delegations from countries that have made enormous financial bets on LNG infrastructure. The logic is not hard to follow. Nations that have spent billions building LNG export terminals, regasification plants, and carrier fleets have a powerful incentive to ensure that the fuel remains viable for as long as possible, ideally written into international shipping standards as a legitimate transition pathway. When those countries sit at the negotiating table in London, they bring that incentive with them.

Shipping is responsible for roughly 3 percent of global greenhouse gas emissions, a share that sounds modest until you consider the scale: the sector emits nearly a billion tonnes of CO2-equivalent each year. The IMO's revised strategy, adopted in 2023, set a target of net-zero emissions "by or around" 2050, with interim checkpoints in 2030 and 2040. The language was hard-fought and deliberately ambiguous in places, and the fight over what fills that ambiguity is now well underway.

The case for LNG as a transitional marine fuel rests on a familiar argument: it burns cleaner than heavy fuel oil, produces less sulfur and particulate matter, and existing LNG-powered vessels are already operating at scale. Proponents point to a global LNG-fueled fleet that has grown substantially over the past decade, with major carriers and cruise lines having committed capital to vessels designed around the fuel.

But the climate math is increasingly contested. LNG is predominantly methane, and methane is a potent greenhouse gas, with a warming potential over 20 years that is roughly 80 times that of CO2. When LNG-powered engines vent unburned methane, a phenomenon known as methane slip, the climate benefit over heavy fuel oil can shrink dramatically or disappear entirely. A growing body of research suggests that on a lifecycle basis, LNG may offer little to no emissions advantage, particularly when upstream extraction and liquefaction are factored in.

This is the uncomfortable reality that LNG-aligned delegations at the IMO are navigating. The strategy appears to be less about winning the scientific argument outright and more about slowing the pace at which alternatives, particularly green ammonia, green methanol, and hydrogen, can be locked in as the preferred pathway. Every year of ambiguity is a year of continued LNG investment recovery.

The geopolitical backdrop has sharpened the stakes considerably. The Strait of Hormuz, through which roughly a fifth of the world's oil and LNG passes at its narrowest point of less than 30 miles, was effectively disrupted following the US-Israeli strikes on Iran. The closure left an estimated 20,000 seafarers stranded aboard approximately 2,000 vessels, a humanitarian crisis that briefly illuminated just how fragile the global energy supply chain actually is.

That fragility is itself a systems-level argument for accelerating the transition away from fossil marine fuels. A shipping sector dependent on LNG is a shipping sector exposed to the same chokepoints, the same geopolitical shocks, and the same price volatility that have long characterized oil markets. Green fuels produced from renewable electricity, by contrast, can in principle be produced almost anywhere, distributing both production and risk.

The second-order consequence worth watching is this: if LNG interests succeed in embedding the fuel as a recognized transition pathway in IMO frameworks, it will shape shipbuilding orders for the next two decades. Ships have operational lifespans of 25 to 30 years. An LNG-powered vessel ordered today will still be sailing in the 2050s, the very decade the IMO has targeted for net zero. The infrastructure lock-in is not just financial; it is physical and temporal.

The countries pushing hardest for a genuine zero-emissions pathway, many of them small island states with the most to lose from rising seas, are also the ones with the least leverage in a negotiating body where influence tends to track economic weight. Whether the IMO's process can hold against that asymmetry may be one of the more consequential questions in climate diplomacy that almost nobody outside the sector is paying attention to.