This is the second installment of a multimedia series about urban metabolism and its utility in city planning and management while shifting resource flows from linear toward circular. As part of UN Environment’s Global Initiative for Resource Efficient Cities (GI-REC), these educational posts and videos produced by Ecocity Builders in coordination with the Sustainability Institute, urban Modelling and Metabolism Assessment, and Metabolism of Cities, seek to equip city managers and practitioners with the tools and knowhow to build and transition towards low-carbon, resilient, and resource efficient cities using integrated systems approaches such as urban metabolism.