Terradas set up the first team researching terrestial ecosystems in Catalunya and was the driving force behind the University of Barcelona's Centre for Ecological Research and Forest Applications (CREAF). He headed the Spanish Association of Terrestial Ecology and was vicepresident of the Catalan Institute of Natural History. He is a member of the Institute of Catalan Studies and has won, among other awards, the Narcís Monturiol medal and the Generalitat's Environment Prize. He has published over 200 articles, both specialist and popularising environmental issues, and books such as "Biografía del mon" (Biography of the World), "Ecología de la vegetación", "Ecología urbana" and "Ecología del foc" (Ecology of Fire). He has also won the Miquel Martí i Pol prize and the Englantina d'Or at the Barcelona Jocs Florals for his stories and poems.