The strategy adopted by the International Maritime Organization (IMO) in April to decarbonize shipping will probably only result in a move away from fossil fuels in the medium term. Although ammonia is likely to become competitive from the mid-2030s and replace fossil ship fuels, this will initially only be in the form of blue ammonia, which is produced from natural gas, whereby the carbon dioxide (CO₂) produced is captured and stored or used (via CCS). E-ammonia, which is produced using hydrogen generated from renewable electricity, is not expected to gain market share until the 2040s. This is the result of an initial assessment of the IMO resolutions by the British consultancy UMAS and University College London (UCL).