Source: Adapted from Notteboom, T., Van der Lugt, L., Van Saase, N., Sel, S., Neyens, K. (2020) “The role of seaports in Green Supply Chain Management: initiatives, attitudes and perspectives in Rotterdam, Antwerp, North Sea Port and Zeebrugge”, Sustainability, vol. 12, 1688 https://doi.org/10.3390/su12041688