Sites worth visiting

World Greenroof Congress Basel 2005
Office for Environmental Research and Design
Global Ecovillage Network
Technical Ecology and Methodology, TU Delft
Vogelwerkgroep Amsterdam
Milieucentrum Amsterdam
Vertical Green
Groen in de Stad
Green Guerillas
Global Urban Development
Groene Metropolen (english)
Green City Visions
Wikipedia: Green roof
earth pledge green roofs initiative
Chicago City Hall Green Roof