Danish research and demonstration initiative Project Cleanship on Thursday (15 January) said its new data, collected during real-world sailing, documented significant climate benefits from biofuel for the shipping industry.
The findings have been submitted to the International Maritime Organization (IMO).
Soot particles – also known as Black Carbon – are among the most harmful emissions from shipping, both for the climate, where they contribute to global warming and melting of Arctic ice, and for public health through poor air quality. Now, experts from the CLEANSHIP project document that using biodiesel, specifically B100 FAME, during normal operation can reduce Black Carbon emissions by up to 81% compared to traditional marine gas oil (MGO).
The measurements were carried out on the Uni-Tankers A/S ers vessel Falstria Swan, where an advanced online Black Carbon sensor from Green Instruments, developed in collaboration with Danish Technological Institute, made it possible to track emissions in detail and in real time during the vessel’s normal operation.
“We expected that biofuel would lead to cleaner combustion, but the magnitude of the reduction – especially at lower engine loads – is a very positive surprise. This demonstrates that biodiesel can reduce not only net CO₂, but also Black Carbon, which is highly significant for the shipping sector’s total climate footprint. At the same time, the measurement technology allows us to monitor emissions with much greater detail than ever before,” says Simon Martin Spangenberg Bastrup berg, consultant and measurement specialist in alternative fuels and emission reduction at Danish Technological Institute.
For Uni-Tankers, the measurements translate directly into new, practical knowledge:
“The latest real-world sailing data on biodiesel (B100) give us a clear picture of both the black carbon footprint and actual CO₂ emissions. This insight is crucial for achieving our own reduction targets, while also contributing to better, data-driven recommendations for reducing emissions across the shipping industry,” said Troels Reppien en, Technical Director at Uni-Tankers A/S .
Although biodiesel demonstrates a significant reduction in Black Carbon, current global production of biofuel can only cover a small share of the global fleet’s total energy demand. Therefore, the Cleanship project continues to analyse data and work towards recommendations on how Black Carbon and other emissions can be effectively reduced in shipping.
The results from the measurement campaign have now been submitted to the International Maritime Organization (IMO) in the form of a white paper. This documentation will contribute to the international efforts to reduce Black Carbon emissions – especially in Arctic regions, where soot particles have a particularly significant climate impact on ice and the environment.
The white paper is scheduled for consideration at IMO’s 13th session of the Sub-Committee on Pollution Prevention and Response (PPR), which will take place from 9 to 13 February 2026.
Photo credit: Project Cleanship
Published: 19 January, 2026
