Dr Gabarrell i Durany, Professor in the Department of Chemical, Biological and Environmental Engineering of UAB (www.uab.cat), is Director of ICTA-UAB (www.icta.cat) María de Maeztu Unit of Excellence (CEX2019-000940-M), and Scientific Coordinator of the SMART-ER in the ECIU University (https://www.eciu.org/). He leads the research group on Industrial Ecology called Sostenipra (www.sostenipra.cat), and the Fertilecity project (www.fertilecity.com). He is an expert in Circular economy, urban agriculture, Life Cycle Analysis (LCA), Material Flow Analysis (MFA), and waste management. 24 researchers (17 from 2011) have successfully finished and defended a PhD/doctorate thesis under his supervision. He is included in the Reuters list of the world’s top 1000 climate scientists according to how influential they are.