The thesis covers the role of the Green Space Factor (GSF) system as a nature-based solution for ecological urban planning in the sustainable city. One main focus for sustainable urban development is the aspect of constructing green spaces and green buildings in order to improve land-use efficiencies and thus minimize negative environmental impacts. Hence, in this study research is made through conducting a qualitative municipal document analysis on how the GSF system is portrayed and implemented in urban planning strategies based on the municipalities of Malmö and Gothenburg. To limit the study, two urban areas are selected for further investigation, the Western harbour in Malmö City and the Freeport in Gothenburg City. The documents included in the study are based on three categories of developing the chosen urban areas: visions, area programs and detailed plans. From the document analysis, several categories or themes were extracted consisting of future goals and vision, actors and trademarks, visionary sustainability, climate change adaptation strategies, sustainable urban development models, green infrastructure, and lastly strategies and design principles of the Western harbour and the Freeport. The results are analysed through the theory of neoliberalised urban climate change adaptation strategies and green fix as crisis management. In order to include the local context of sustainable urban development, environmental policy localization is also included in the analysis of the results. The results from the analysis of the empirical material show that the municipalities of Malmö and Gothenburg have implemented the GSF planning system into the local context of their visions, area programs and detailed plans of both the Western harbour and the Freeport. The GSF system is included in both urban planning strategies through indirect terminologies connected to general sustainable development, such as climate change adaptation, green infrastructure and design principles showcasing the desired sustainability strategies. However, the results present the risk of market-based sustainability trademarking. The study concludes on the mark that it is important for the cities to on one hand implement the GSF system into the overall policies design, and on another hand face sustainable urban development at a variety of spatial scales in order to meet the external requirements originating in the localization of environmental policies.