Environmental scientists, engineer, and activists analyze the concept of the circular economy, emphasizing the different contexts in which the circulation of materials through the economy takes place. They cover history, theory, and experience; consumption, design, and behavior; waste and resource recovery; and technology and systems innovation. Their topics include from Spaceship Earth to the circular economy: the problem of consumption, circular by design: a model for engaging small and medium fashion and textile companies with strategies for designed reuse, renewing materials: implementing three-dimensional printing and distributed recycling in Samoa, towards an agile circular economy for the building industry, and re-valuing construction materials and components through design for disassembly.