Social media data for environmental sustainability : A critical review of opportunities, threats, and ethical use - Ghermandi, Andrea (University of Haifa. Department of Natural Resources and Environmental Management) ; Langemeyer, Johannes (Universitat Autònoma de Barcelona. Institut de Ciència i Tecnologia Ambientals) ; Van Berkel, Derek (University of Michigan. School for Environment and Sustainability) ; Calcagni, Fulvia (University of Haifa. Department of Natural Resources and Environmental Management) ; Depietri, Yaella (University of Haifa. Department of Natural Resources and Environmental Management) ; Egarter Vigl, Lukas (EURAC Research. Institute for Alpine Environment) ; Fox, Nathan (University of Southampton. School of Geography and the Environment) ; Havinga, Ilan (Wageningen University. Environmental Systems Analysis Group) ; Jäger, Hieronymus (University of Innsbruck. Department of Ecology) ; Kaiser, Nina (University of Duisburg-Essen. Department of Aquatic Ecology) ; Karasov, Oleksandr (University of Helsinki. Department of Geosciences and Geography) ; McPhearson, Timon (Stockholm University. Stockholm Resilience Centre) ; Podschun, Simone (Leibniz Institute of Freshwater Ecology. Department of Ecohydrology and Biogeochemistry) ; Ruiz Frau, Ana (Institut Mediterrani d'Estudis Avançats) ; Sinclair, Michael (University of Haifa. Department of Natural Resources and Environmental Management) ; Venohr, Markus (Leibniz Institute of Freshwater Ecology. Department of Ecohydrology and Biogeochemistry) ; Wood, Spencer A. (University of Washington. eScience Institute)