Increasing socio-economic inequalities, biodiversity loss and urban transformations potentially aggravate spatial disparities within cities and favour unequal access to nature, with adverse effects on the quality of life of their inhabitants. The thesis develops a conceptual and action model for the strategic planning of 'Green Infrastructure' (GI), which aims at a just access to ecological space in the city. The model forms the basis of an analysis carried out in Vienna and Munich, and indicates potential interventions at two levels: First taking into due consideration GI integration before development takes place and a renewed discussion on basic needs and urban green area qualities with regard to GI’s physical shaping. Second the importance of developing adequate governance capabilities, particularly in relation to property entitlements and political, economic and articulation powers.