Hello!
Another well written paper by Maersk Mc-Kinney Moller Center for Zero Carbon Shipping.
Paragraph 6 discusses the unintended increase in global emissions that the CII regulation might cause. Check the below passage:
"6.1 The risk of increased emissions
There is a non-negligible risk that some of the energy efficiency regulations discussed in this report will lead to increased GHG emissions. This may seem counter-intuitive: however, it is important to highlight that the metrics underlying the regulations focus on carbon intensity (i.e., grams of CO2 per tonne-nautical miles), and that it is possible to decrease carbon intensity while increasing actual CO2 emissions. To give an extreme example, emissions from a vessel that stays in port for most of a given year will have no nautical miles attached to them, leading to an excessively high attained CII. On the other hand, a vessel that sails for most of the year will simultaneously increase its emissions and its nautical miles sailed, yielding a good CII rating. Perversely, the latter situation leads to much higher CO2 emissions but a better CII rating.
Therefore, the CII does not penalize all CO2 emissions equally. For the purposes of attaining a good CII rating, there is a greater benefit from reducing the ‘non-sailing’ (i.e., not leading to motion) CO2 emissions, even if smaller in quantity, than in reducing the ‘sailing’ (i.e., leading to motion) CO2 emissions. In fact, the process of reducing the ‘non-sailing’ CO2 emissions may see them replaced by more carbon-intense ‘sailing’ emissions.
The role of Energy Efficiency Regulations_v9.pdf (11.5 MB)
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