“…Indeed, many scholars have discussed the impacts of the COVID-19 epidemic on the shipping industry ( Pan et al, 2022 ; Xu et al, 2022c ; Zhou et al, 2022 , Zhou et al, 2022 , Zhou et al, 2022 ). However, the previous researchers focused on the shock of the COVID-19 epidemic on the port performance and shipping network, which can be thought to be the important factors of long-term trend in carbon emission from vessel-source pollution ( Xu et al, 2021c ; Bandyopadhyay and Bhatnagar, 2023 ; Wang et al, 2022 , Wang et al, 2022a , Wang et al, 2022b ; Zhou et al, 2022 , Zhou et al, 2022 , Zhou et al, 2022 ; Chen et al, 2022c ). On this basis, there existed a discussion on carbon emissions in Western Singapore caused by marine traffic during the COVID-19 epidemic ( Ju and Hargreaves, 2021 ).…”