Shipping Carries 90% of World Trade and 3% of Its Carbon. The First Global Price on That Carbon Lost by 8 Votes.
In April 2025, 63 countries at the UN's shipping body signed off on the outline of a first-of-its-kind idea: a single, mandatory carbon price covering almost every big cargo ship on Earth. Six months later, with final adoption days away, a procedural motion to delay it for a year passed by just 8 votes. The rematch is scheduled for this November — and almost everything that reaches you by container is riding on the outcome.
The GFI meter: where your ship lands sets the price
Drag the slider to set a ship's GHG Fuel Intensity (GFI) — grams of CO2-equivalent per megajoule of fuel, well-to-wake. Thresholds shown are the IMO's published 2028 targets (Direct Compliance 77.44, Base 89.57, against a 2008 baseline of 93.3). The dollar figure assumes an illustrative mid-size containership burning ~150 tonnes of fuel/day over a 14-day voyage (~86,100 GJ total) — real compliance is settled annually across a ship's whole year of fuel use, not per voyage. Press Run to sweep from dirty fuel to clean.
The plain version
Picture every big cargo ship on Earth — all roughly 60,000 container ships, tankers, and bulk carriers over about 5,000 gross tons — facing the same rule, enforced by the same global body, at the same time. That's what the United Nations' shipping agency, the IMO, tried to lock in during 2025: not a speed limit, but a cleanliness limit, measured by how much carbon pollution a ship's fuel produces per unit of energy it burns.
Here's the plain mechanic. Every ship gets an annual target for its fuel's carbon intensity — think miles-per-gallon, but for emissions instead of distance. There are actually two targets, a tough one and a looser one. Beat the tough target and you earn a tradable credit. Miss the looser one and you owe real money: $100 for every excess tonne of CO2-equivalent at first, jumping to $380 a tonne for the worst offenders. That money is meant to flow into a new global fund that helps pay for cleaner marine fuels and supports poorer countries during the switch.
It would be the first time any UN agency has put a mandatory, worldwide price on carbon for an entire transport industry, binding on nearly every large cargo ship everywhere, all at once. About 90% of the physical goods you own — the phone, the laptop, the car parts, the server racks behind every AI chatbot — crossed an ocean to get to you. This fee, if it survives, rides quietly along on that freight bill.
In October 2025, with final sign-off just days away, the United States led a push to delay the whole thing — and won, by a margin of just 8 votes out of roughly 135 cast. The world's governments reconvene this winter to try again.
The expert version
The mechanism is the IMO's Net-Zero Framework, approved in principle by 63 states at MEPC 83 (April 2025) as draft amendments to MARPOL Annex VI. It sets annual GHG Fuel Intensity (GFI) targets — grams of CO2-equivalent per megajoule of fuel energy, measured well-to-wake — against a 2008 industry-average baseline of 93.3 gCO2e/MJ. Each compliance year carries two targets: a stricter Direct Compliance Target and a looser Base Target. For 2028, the first enforcement year, those sit at 77.44 and 89.57 gCO2e/MJ (17.0% and 4.0% below baseline respectively), tightening on a published schedule — 73.71/85.84 in 2030, 53.18/65.31 by 2035 — consistent with the IMO's 2050 net-zero goal.
A ship whose annual fleet-weighted GFI lands between the two targets incurs a Tier 1 deficit, covered with Tier 1 Remedial Units priced at a fixed $100 per tonne CO2-equivalent through 2030. A ship that misses even the looser Base Target incurs a steeper Tier 2 deficit on the additional gap, priced at $380 per tonne. Ships that beat the Direct Compliance Target generate tradable Surplus Units, bankable for two years, sellable to deficit ships or contributable to the IMO's new Net-Zero Fund — estimated by framework proponents to raise on the order of $10 billion annually at full implementation, earmarked for zero/near-zero fuel R&D (green methanol, ammonia, biofuels) and support for Least Developed and Small Island Developing States.
Coverage: ships over 5,000 gross tonnage on international voyages, an estimated 60,000-vessel fleet responsible for roughly 85-90% of international shipping's fuel use, in a sector emitting on the order of 3% of global CO2 — more in a year than Germany. Formal adoption needed an October 14-17, 2025 extraordinary MEPC session; instead, a procedural motion to adjourn by a year passed 57 to 49 (21 abstentions, 8 absent), after a reported US diplomatic campaign — including threatened tariffs and port-fee retaliation against supportive flag states — joined by Saudi Arabia and others citing competitiveness concerns. A working group met September 1-4, 2026; adoption will be retried at MEPC 85 (November 30-December 3, 2026). If it passes, tacit-acceptance procedure puts earliest entry into force around March 1, 2028.
Why it matters for tech + supply chain: if this fee survives the redo, it becomes the first line item every ocean-shipped chip, server rack, and EV battery quietly pays toward decarbonizing the ship that carried it — and the industry has six weeks to find out whether that's real or delayed another year.
Why it matters for tech + supply chain: a $100-380/tCO2e global compliance cost would be the first mandatory carbon price touching nearly all seaborne freight — a new, structural line in landed cost for every fab tool, server rack, and battery pack that travels by container, and a template the aviation and trucking sectors are both watching.