Naval Auxiliary Fuel & CO₂
Replenishment oilers, fleet tankers, sealift ships. Exempt from IMO regulation (Article 3.3 of MARPOL) but most navies now track CO₂ per steaming day as an internal metric - NATO Green Defence Framework.
Operational year
Fuel
Annual CO₂
44,884.0t
Daily fuel
58.33t/day
CO₂ per steaming day
187.017t / day
Formula, assumptions, and limits
$$\text{CO}_2^\text{year} = \sum_j F_j \cdot C_{f,j}$$
$$\text{Intensity} = \frac{\text{CO}_2^\text{year}}{d_\text{steam}}$$
NATO Green Defence tracks fleet fuel-intensity but does not enforce MARPOL carbon. USN's Great Green Fleet demonstrated 50 % biofuel underway; RFA and others trial GTL and HVO.
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