The city of Curitiba aims to be carbon neutral by 2050. This will require addressing multiple related challenges including energy, transport and waste management. City residents rely on hydroelectricity (and other power sources), but it has become increasingly scarce and expensive. Despite an impressive history as a world leader in developing active mobility and public transport, private car ownership continues to rise. And each day, 80% of solid waste collected in the city is sent to landfills. How can we create zero carbon neighborhoods that build on historic urban infrastructure and character, integrate multiple urban functions, and promote economic opportunity and green job growth for local residents?