Ports are big emitters of carbon emissions and often spend a lot of money and time on carbon emission reduction. Therefore, this paper constructs a port carbon emission reduction investment decision-making model under the uncertainty of carbon emission amount and carbon trading price, which taking the minimization of carbon emission reduction comprehensive cost as the optimization objective including some key factors such as the budget constraint of port carbon emission investment, carbon emission quota, and so on. At last, the case study of Shanghai port is carried out, and the optimization results show that Shanghai port should invest 3.10 Yi yuan in 2019 for carbon emission reduction. It is useful for the port carbon emission reduction managers and policy makers.

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