We are facing a climate crisis accompanied by biodiversity loss. Sea level rise has a growing impact on low-lying coastal areas, also due to economic activities and population growth. These developments result in a decreasing extent of salt marshes in the coastal zone. Salt marshes are salt-tolerant ecosystems in the intertidal area. These ecosystems can attenuate waves, decrease coastal erosion and sequester carbon, whilst also preserving biodiversity. This research aims to quantify the contribution of constructed salt marshes to climate change adaptation and mitigation. Our findings will enable the sustainable protection of low-lying coastal areas and biodiversity through salt marshes.