The SEAREG -project focuses on the socio-economic and environmental assessment of climate change in the Baltic Sea region (BSR) specially the sea level rise and the changing runoff patterns of rivers. These can both lead to major flooding events having severe impacts on the spatial development of cities and regions as well as sustainable development of entire BSR. The results of the project will be summarized in decision support system for impact assessment. This decision support system will be addressed to both local and regional planning authorities in the case study areas and the BSR cooperation on spatial planning in general.