This seminar explores the dynamic intersection between urban planning and political ecology. Political ecology is an interdisciplinary approach to study environmental issues, emphasizing how social inequalities, economic activities and political processes are interwoven with environmental change. Rethinking urban planning in an age of climate crisis, this seminar critically examines planning practices but also attempts to reimagine and build alternative human-environment relations to overcome the impasse at this time of ecological breakdown.First, we will engage with academic literatures to gain a foundational overview of political ecology, highlighting its critique of urban environmental injustices and its focus on the socio-nature of cities. This includes delving into key concepts of political ecology such as power, scale, nature and urbanisation. Second, we examine how urban planning is intertwined with contemporary ecological questions, shaped by historical trajectories and global processes. Through case studies, we analyse how planning practices can either reinforce or resist unequal power structures that drive environmental degradation and exclusion. Third, we inquire into the possibilities for building an alternative set of urban planning practices through the political ecology lens.