EARTHONE is a European project focused on understanding the factors that drive greenhouse gas fluxes in southern and Mediterranean Europe. It combines advanced data-driven technologies with on-the-ground data from vulnerable regions, such as Croatia, Greece, Italy, North Macedonia, Slovenia, and Spain. The project aims to develop solutions for land use, land-use change, and forestry challenges. Over four years, it will use regional pilots to provide evidence-based recommendations, adaptable methodologies, and policy guidelines for stakeholders, including landowners, environmental experts, and policymakers.