Fab City Challenge is an initiative launched in 2014 by the then mayor of Barcelona, “challenging” cities to become self-sustainable by 2054. Since then, the project has expanded to a global network of 28 cities and one country (Georgia), cooperating with each other to improve, implement and exchange their urban practices.

The end-goal is for each city to produce everything they consume. In order to reach its objective, the Challenge vividly promotes increased collective action and co-designed solutions for the common well-being of the planet. That is the main idea of its Manifesto, which contains 10 guiding principles for promoting sustainability and liveability – with actions at local and regional levels.