In the coastal environment, the protection of ecosystems emphasises the interdependence of each part with the whole. Therefore, the importance and urgency of adopting effective strategies to combat climate change and conserve biodiversity to protect fragile coastal ecosystems are evident. In an area of the western Ligurian coast from Finale Ligure (SV) to Vado Ligure (SV), the study uses two models developed by Stanford University in the open source software InVEST (Integrated Valuation of Ecosystem Services and Tradeoffs). This thesis aims to demonstrate how the value of Coastal Ecosystem Services and damage caused to marine phanerogams (Posidonia Oceanica and Cymodocea Nodosa) can be quantified in economic terms and in terms of coastal vulnerability.