The 83rd Session of the IMO Marine Environment Protection Committee (MEPC) occurred 7–11 April 2025 at IMO Headquarters (London, UK). Among numerous agenda items and outcomes, significant and long awaited amendments to Annex VI of MARPOL, including the additions of a Chapter 5: Regulations on the IMO Net-Zero Framework, and the designation of the North-East Atlantic as an Emission Control Area (ECA) under MARPOL, Annex VI, Regs 13-14.
The Regulations of the IMO Net-Zero Framework would, subject to exceptions, apply to all ships of 5,000 gross tonnage and above (Reg 30), with the defined objective (Reg 31):
“1 The goal of this chapter is to reduce greenhouse gas (GHG) emissions from international shipping as soon as possible, delivering on the reduction targets set out in the 2023 IMO Strategy on Reduction of GHG Emissions from Ships, 67 effectively promoting the energy transition of shipping and providing the world fleet with a needed incentive while contributing to a level playing field and a just and equitable transition”.
IMO Secretariat, Circular Letter No.5005 (2025) p. 53.
As summarised by IMO Secretariat, the IMO Net- Zero Framework will principally provide:
“Global fuel standard: Ships must reduce, over time, their annual greenhouse gas fuel intensity (GFI) – that is, how much GHG is emitted for each unit of energy used. This is calculated using a well-to-wake approach.
Global economic measure: Ships emitting above GFI thresholds will have to acquire remedial units to balance its deficit emissions, while those using zero or near-zero GHG technologies will be eligible for financial rewards”.
Ships operating within the North-East Atlantic Emission Control Area (ECA) will be subject to Regulation 13 addressing particular requirements concerning Nitrogen oxides (NOx) and Regulation 14 addressing particular requirements concerning sulphur oxides (SOx) and particulate matter. The North-East Atlantic Emission Control Area will be the area described by the coordinates provided in para 7 of Appendix VII to Annex VI of MARPOL, summarised as:
“6. The North-East Atlantic Emission Control Area (NE Atlantic ECA) encompasses the Exclusive Economic Zones (EEZ) and territorial seas, extending up to 200 nautical miles from the baselines of Greenland, Iceland, the Faroes, Ireland, the mainlands of the United Kingdom, France, Spain and Portugal. This designation excludes the seas bounded by the North Sea area, as defined in regulation 1.14.6 of Annex V of the present Convention”.
IMO Secretariat, Circular Letter No.5005 (2025) p. 98.

The approved draft amendments to Annex VI of MARPOL anticipate being formally adopted at an extraordinary session of the Marine Environment Protection Committee (14-17 October 2025), which would foresee an entry into force 16 months later, under the tacit acceptance procedure, i.e. 17 February 2027. Two Particularly Sensitive Sea Areas (PSSAs) were, in principle, agreed for designation (“Reserva Nacional Dorsal de Nasca” (Nasca Ridge National Reserve) and “Reserva Nacional Mar Tropical de Grau” (Grau Tropical Sea National Reserve)), but Peru was invited to further develop the proposed associated protective measures for submission and approval consideration at the 84th MEPC Session.