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In times of energy transition and global efforts being made toward net zero, maritime transportation with its global fleet operating worldwide plays a key role. However, despite sufficient technology readiness in both ship- and shore-side solutions, bunkering facilities dedicated to green fuels are not widely available in seaports. With massive investments at stake, it is crucial to identify the perspectives of all potential stakeholders and the factors they find relevant for deciding on the location of bunkering infrastructure. Therefore, to select the most suitable location for such a bunkering station, combined Multi-Criteria Decision-Making methods were used along with expert elicitation. The identified criteria were subsequently validated through their application using a case study of Polish seaports. The research was conducted for marine alternative fuels in general as well as for bio-methanol, which was selected by stakeholders as having the highest potential for early implementation. In order to increase the practical application of the results, a model vessel was defined and used to verify the criteria obtained. The results of the case study indicate that the most essential decision-making criterion in both research scenarios is the reliability of the fuel supply chains. Concerning a potential location for launching bunkering stations among considered major Polish seaports is the port of Świnoujście followed by the port of Gdańsk or Szczecin depending on the case study scenario. The results of this study may be considered useful for strategic decision-makers engaged in maritime transportation, fuel supply chains, and environmental protection. [ABSTRACT FROM AUTHOR]

A recent publication of two independently performed studies investigating a very similar topic of green shipping, applying very similar methods (bibliometric analysis) on very similar data sets (scientific databases) provides an opportunity for an unbiased analysis of what factors can impact the outcome of one's research. This discussion paper reviews and compares the two following papers: • Ampah, J.D., Yusuf, A.A., Afrane, S., Jin, C., Liu, H., 2021. Reviewing two decades of cleaner alternative marine fuels: Towards IMO's decarbonization of the maritime transport sector. J. Clean. Prod. 320, 128871. https://doi.org/10.1016/j.jclepro.2021.128871 • Kołakowski, P., Gil, M., Wróbel, K., Ho, Y., 2021. State of play in technology and legal framework of alternative marine fuels and renewable energy systems: a bibliometric analysis. Marit. Policy Manag. https://doi.org/10.1080/03088839.2021.1969460 This paper aims to conclude on the insights arising from both papers concerning their different methodological peculiarities. • Commentary on two independent bibliometric studies on alternative fuels for shipping. • Similarities and differences of both studies discussed. • Current commentary offers key insights into the use of bibliometric analysis. [ABSTRACT FROM AUTHOR]