List of <i>sustainability categories</i> (<i>SCi</i>).

Companies are not legally obliged to disclose their commitment to Sustainable Development Goals (SDGs). Despite this, many decide to build their competitive position on the basis of marketing communications about sustainability practices. This paper investigates the landscape of sustainability communications practices within ferry operators in the Baltic Sea Region. The authors have developed an index based on two sources of information: (1) an expert assessment of sustainability categories built on the basis of the SDGs, and (2) an assessment of marketing communications of ferry companies. The results of the study identified three distinct patterns of conduct. An analysis revealed that voyage safety and greenhouse gas emissions are the two categories which the ferry companies are most committed to. The results show that marketing communications on the realisation of social goals gives way to that on commitment to the realisation of environmental goals. Beyond insights into the ferry market, the study presents a valuable methodological tool for assessing sustainability communications across diverse industries.企业并无法律义务披露其针对可持续发展目标（Sustainable Development Goals, SDGs）的承诺。尽管如此，仍有诸多企业选择依托围绕可持续发展实践的营销传播来构筑自身市场竞争优势。本研究聚焦波罗的海区域轮渡运营商的可持续发展传播实践整体格局。研究团队基于两类信息来源构建了一套评估指标：其一为基于可持续发展目标搭建的可持续发展分类专家评估体系，其二为针对轮渡企业营销传播内容的评估框架。本研究结果归纳出三类截然不同的运营范式。分析表明，航行安全与温室气体排放是轮渡企业最为重视的两类可持续发展范畴。研究结果显示，围绕社会目标实现的营销传播，让位于聚焦环境目标实现的相关传播内容。本研究不仅为轮渡行业市场提供了针对性洞见，更为跨行业的可持续发展传播评估提供了一套极具应用价值的方法论工具。