1. Institute of Environmental Science and Technology, Universitat Autònoma de Barcelona (ICTA-UAB), Barcelona, Spain
2. Institute of Environmental Science and Technology, Universitat Autònoma de Barcelona (ICTA-UAB), & Institució Catalana de Recerca i Estudis Avançats (ICREA), Barcelona, Spain
3. School of Community and Regional Planning, University of British Columbia, Vancouver, Canada
4. Internet Interdisciplinary Institute (IN3), Universitat Oberta de Catalunya, Barcelona, Spain