RT Journal Article T1 Urban metabolism, sustainability and energy transition in cities: A comprehensive review A1 Galán Cano, Lucía A1 Cámara Aceituno, Juan A1 Hermoso Orzáez, Manuel Jesús A1 Mena Nieto, Ángel Isidro A1 Terrados Cepeda, Julio AB This research article conducts a comprehensive literature review on the concept of urban metabolism (UM), with a special focus on the transition from a linear to a circular model. In the context of climate change, increasing urbanisation, and resource depletion, cities are recognised as playing a crucial role in environmental sustainability.A bibliometric analysis of scientific literature shows an increasing interest in circular UM as a comprehensive approach to managing energy and material flows in urban settings. This article aims to further explore the transition from a linear to a circular model by reviewing the evolution of the urban metabolism concept, its key components, and relevant case studies from cities that have successfully implemented circular strategies. By identifying barriers and challenges cities face in adopting circular practices within their urban metabolism, the article proposes recommendations to overcome these obstacles. Furthermore, it examines the interrelationships between circular UM and the Sustainable Development Goals (SDGS), particularly in terms of sustainable urban planning and energy transition. However, important challenges remain, such as the lack of standardised andaccessible data that hinders comparisons between cities and their evolution. Finally, future lines of research are proposed that focus on the integration of new technologies, such as artificial intelligence and neural networks, as well as the development of circular urban models that can tangibly measure their impact on climate change. This review provides a comprehensive overview of the current state of the art of UM while enriching the existing body of knowledge on emerging trends in this field. PB Elsevier SN 2590-1230 (electrónico) YR 2025 FD 2025-04 LK https://hdl.handle.net/10272/25399 UL https://hdl.handle.net/10272/25399 LA eng NO Galán-Cano, L; Cámara-Aceituno, J; Hermoso-Orzáez, M.J. Mena-Nieto, Á., Terrados-Cepeda, J. (2025). Urban metabolism, sustainability and energy transition in cities: A comprehensive review. Results in Engineering, 25, 104278, https://doi.org/10.1016/j.rineng.2025.104278 NO R+D+I Project."Sustainability and resilience of medium-sized cities and their contribution to the energy transition: circular urban metabolism, energy scenarios and indicator proposals. Acronym: METURBAN2030. 2022-2025. Funding entity: Ministry of Science and Innovation of Spain. DS Repositorio Institucional de la Universidad de Huelva RD 13 jul 2026