This used to be true, but it's quite little bit less so since about a year: https://www.theguardian.com/environment/2020/jan/01/shipping-fuel-regulation-to-cut

This used to be true, but it's quite little bit less so since about a year: https://www.theguardian.com/environment/2020/jan/01/shipping-fuel-regulation-to-cut-sulphur-levels-comes-into-force https://www.theguardian.com/environment/2020/jan/01/shipping...