Acknowledgements
We would like to thank all participants of the AAG stream “exploring the geography of socio-technical transitions to environmentally sustainable economies” in Washington, DC, 2010, the reviewers and especially Phil Cooke for facilitating this special issue in European Planning Studies. Editorial work for this special issue was partially conducted while one of the authors (B. Truffer) was a fellow in the Sustainability Science Program at Harvard University: support is gratefully acknowledged.