Solid structures: award-winning ESD up close : a tour of award-winning learning spaces, networks and local authorities in the UNESCO Global Action Programme on Education for Sustainable Development / published by German Commission for UNESCO e.V. ; editors Friederike Hoff, Thea Buchholz, Bianca Bilgram, Sarah Henk and Nadine Thunecke (responsible for content), Philip Schimpf, Lukas Hettmannsperger and Max Richter