Marginal Abatement Cost
Marginal abatement cost (MAC) ranks decarbonisation measures by $ per tonne of CO₂ avoided - slow steaming, hull cleaning, WHR, LNG, methanol, RFNBO. Sort ascending, cumulate against abatement needed, and you have the optimal-sequence stack.
Measure
Net annual cost
-230,000USD/year
MAC
-92.0USD / t CO₂
No-regret - saves money AND CO₂
Formula, assumptions, and limits
A NEGATIVE MAC means the measure saves money AND CO₂ (no-regret). A positive MAC less than prevailing carbon price = accept. Rank all candidate measures by MAC ascending and you have the efficient decarbonisation sequence.