We are undeniably living in an era of enormous environmental crisis with climate change and species extinction as the most outstanding features of it. These issues challenge our societal systems and relationship with nature. In addition, more than half of the planet's population live in urban areas, where environmental problems tend to culminate and where counteractive efforts should be concentrated. How can landscape architecture solve these urgent problems? This dissertation provides new scientific knowledge on collaborative planning and design of urban socio-ecological systems.