As the international community became more aware of the seriousness of climate change, countermeasures against it are emerging as a global priority paradigm. Marine ecosystems are known to absorb carbon faster than terrestrial ecosystems, and to achieve carbon neutrality, blue carbon, a carbon absorption source in the field of marine fisheries, should be expanded more. To actively respond to the climate crisis, it is necessary create more carbon-absorbing and climate-adaptive coasts, or living shorelines, that are suitable for the domestic situation. Based on our extensive experience, GeoSystem Research can find the right areas to create such living shorelines and conduct raising seedlings and planting of marine plants (such as saltwater plants) for the same purpose. We can detect changes in marine sediments and marine organisms through the creation of living shorelines and calculate the carbon sink coefficient of each sediment or organism types. By doing so, we can verify the living shorelines’ carbon absorption capabilities and effect of improving ecological functions, then make guidelines and suggest future improvements.