Global climate change mitigation is the most important alternative to face the threats to our planet but poses ample challenges for society,governments and policy makers around the world. Within the climate debate, there is a key focus on the climate mitigation potential ofnatural carbon sinks. Nevertheless, there are major knowledge gaps concerning the functioning and vulnerability of these sinks and theircritical link to climate compensation capacity and conservation policies, especially regarding the complex coastal marine environments ofthe Baltic Sea. The project will assess and quantify total net blue carbon sequestration capacity, greenhouse gas exchange and landscapeconnectivity (export and fate of carbon) coupled to habitat degradation and land-use change to identify hotspots of climate mitigationcapacity in coastal seascapes of the Baltic region. This novel landscape-scale approach to understand and synthesize climate changemitigation capacity of blue carbon habitats will be contextualized in a comprehensive mapping of policy strategies, conservation practices,monitoring and area-based user conflicts across regions. Seascape-wide conceptual climate-carbon models on coastal blue carbon will bedeveloped to identify areas for spatial conservation prioritization and areas of concern, which will benefit managers developing land useplanning and policy-making that just and sustainably safeguard climate regulation services of seascapes in the Baltic Sea.