The analysis presented in this brief shows there is a need for businesses to act, rather than continuing to assume that old business models will remain profitable. Crucial to transforming the global economy towards full circularity is an understanding of how it can be achieved while still maintaining business value. This brief first examines the mass-value-carbon and value chain approaches, before considering sectors that have shown promise in transforming towards circularity. These includes key opportunities within food systems, the electronics value chain and the construction value chain, though examples also exist within many other sectors.