Transforming the world's energy systems, cities, and land-use systems to become low-carbon and resilient will require a large-scale change in global finance flows. The magnitude of financing is in the order of trillions of dollars per year, of which a large amount comes from the private sector. It is therefore critical that scarce public resources are deployed in a way that catalyzes the required redirection of finance. Blended finance aims to achieve exactly that, and therefore has attracted significant interest in recent years.