New possibilities for climate change countermeasures in ports: Organic carbon containment and creation of blue carbon ecosystems through beneficial utilization of dredged soil

As climate change has attracted increasing global attention, carbon neutral ports (CNPs) have been set as government policies in Japan. In this research, with the aim of providing a more reliable basis for policy making concerning ports, we proposed the carbon storage through stable containment of organic carbon present in dredged soil as a new climate change countermeasure in ports. Furthermore, it was revealed through scenario analysis that the containment effect through beneficial utilization of dredged soil as foundation materials for blue carbon ecosystems (BCEs) and carbon storage by BCEs have significant meanings for the realization of CNPs and sinks for the residual emissions, considering the necessity to promote dredging projects for the development of the next generation of import bases toward the realization of CNPs, which may result in the generation of a large amount of dredged soil. In a country like Japan, whose port policies and port governance make it difficult to actively promote climate change countermeasures by each port, the feasibility of these new countermeasures would depend on the government’s initiative. It would be a world-leading effort to focus on port development in addition to port operation, and utilizing the dredged soil and BCEs as carbon sinks.