Capped steam ahead: A case study among ship operators on a maritime ETS

International shipping is an important emitter of greenhouse gases. The International Maritime Organization (IMO) is discussing different approaches to reduce maritime CO2 emissions, in particular market-based mechanisms. In this paper, we assess potential implications of a maritime emission trading scheme (ETS) on the organisation and operations of shipping companies, primarily on the basis of a case study involving ship operators. Our results suggest that there is no knock-out criterion why a cap-andtrade approach should not work in the shipping sector in practice. A maritime ETS has the potential to engage this sector into cost-efficient emission reduction if designed to account for the special characteristics of the international shipping industry.