[aeroman]

Organisations aiming to reduce sulpfur in ship fuel are defiitly aware of the cooling impact it has on the climate. However, the health benefits of this reduction are not to be understated - with shipping sulfur being responsible for 100s of thousands of premature deaths and millions of cases of childhood astham annually [1].

The cooling effect from ship pollution is there, but it is a relatively small fraction of the ovrall cooling from atmospheric aerosols.

[1] - Sofiev et al, Cleaner fuels for ships provide public health benefits with climate tradeoffs - http://dx.doi.org/10.1038/s41467-017-02774-9