Welcome to the book of blogs, a collection of diverse works from researchers across the globe who all have something important to say about the way in which our world is changing and how we can strive towards a more sustainable future. This book emerged from an International Social Science Council (ISSC) meeting in November 2014 of early career researchers, who gathered in Taiwan to discuss transitions to urban contexts from a social science perspective. The seminar involved weeklong discussions about sustainable urbanisation and the contribution of social science research to sustainable urban futures. Yet a week was not long enough to hear the diverse perspectives within the room, let alone incorporate the plethora of viewpoints beyond it. Within the ISSC discussions we concluded that one definition of sustainable urbanisation is not possible and that sustainable urbanisations are in play. The transitions to urban contexts taking place, and those that are anticipated within our futures, were characterised in terms of their plurality, diversity, fluidity, and change. This book embraces such uncertainty by welcoming dialogues, rather than a monologue, on the urbanisation processes taking place across the world and what to do about the places we build, and the impacts of human activity on the environment, health and climate.