Prof. Vanesa Castán-Broto has published a paper titled “Green City Promises and “Just Sustainabilities” in a new special issue on “Green city: explorations and visions of urban sustainability” edited by Müller, Simone M. and Annika Mattissek, as part of the Rachel Carson Centre Perspectives publication series. This special issue explores the notion of the ‘green’ city from a global interdisciplinary perspective. The papers within this special issue have examined the conflicts inherent within ideas of eco-modernisation, including those relating to ecological justice and inequality. Prof. Castán-Broto’s paper critiques ‘sustainable development agendas’ by positing first that sustainability is not about incremental progress but rather about a radical transformation of current urban development paradigms. Secondly, there is a need to recognise that sustainability challenges are in fact political ones and this brings with them the element of social justice. Thirdly and lastly, the paper argues for a need to recognise the specific socio-ecological contexts within which urbanisation occurs as against imposing a certain preconceived notion of urban development on cities.