International Journal of Environmental Research and Public Health Commentary Urban Climate Policy and Action through a Health Lens—An Untapped Opportunity Audrey de Nazelle 1,2, * , Charlotte J. Roscoe 3 , Aina Roca-Barceló 2 , Giselle Sebag 4 , Gudrun Weinmayr 5 , Carlos Dora 4 , Kristie L. Ebi 6 , Mark J. Nieuwenhuijsen 7,8,9 and Maya Negev 10   Citation: de Nazelle, A.; Roscoe, C.J.; Roca-Barcel ´ o, A.; Sebag, G.; Weinmayr, G.; Dora, C.; Ebi, K.L.; Nieuwenhuijsen, M.J.; Negev, M. Urban Climate Policy and Action through a Health Lens—An Untapped Opportunity. Int. J. Environ. Res. Public Health 2021, 18, 12516. https://doi.org/10.3390/ ijerph182312516 Academic Editor: Paul B. Tchounwou Received: 4 November 2021 Accepted: 25 November 2021 Published: 27 November 2021 Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affil- iations. Copyright: © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// creativecommons.org/licenses/by/ 4.0/). 1 Centre for Environmental Policy, Imperial College London, London SW7 1NE, UK 2 MRC Centre for Environment and Health, Department of Epidemiology and Biostatistics, School of Public Health, Imperial College London, Norfolk Place, London W2 1PG, UK; a.roca-barcelo@imperial.ac.uk 3 Landmark Centre, Harvard T.H. Chan School of Public Health, Harvard University, Boston, MA 02215, USA; croscoe@hsph.harvard.edu 4 International Society for Urban Health, New York, NY 10003, USA; gsebag@isuh.org (G.S.); cdora@isuh.org (C.D.) 5 Institute of Epidemiology and Medical Biometry, Ulm University, 89081 Ulm, Germany; Gudrun.Weinmayr@uni-ulm.de 6 Center for Health and the Global Environment (CHanGE), University of Washington, Seattle, WA 98195, USA; krisebi@uw.edu 7 Institute for Global Health (ISGlobal), 08003 Barcelona, Spain; mark.nieuwenhuijsen@isglobal.org 8 CIBER Epidemiología y Salud Pública (CIBERESP), 28029 Madrid, Spain 9 Department of Experimental and Health Sciences, Universitat Pompeu Fabra (UPF), 08003 Barcelona, Spain 10 School of Public Health, University of Haifa, Haifa 31905, Israel; mnegev@univ.haifa.ac.il * Correspondence: anazelle@imperial.ac.uk Abstract: Motivated by a growing recognition of the climate emergency, reflected in the 26th Confer- ence of the Parties (COP26), we outline untapped opportunities to improve health through ambitious climate actions in cities. Health is a primary reason for climate action yet is rarely integrated in urban climate plans as a policy goal. This is a missed opportunity to create sustainable alliances across sectors and groups, to engage a broad set of stakeholders, and to develop structural health promotion. In this statement, we first briefly review the literature on health co-benefits of urban climate change strategies and make the case for health-promoting climate action; we then describe barriers to integrating health in climate action. We found that the evidence-base is often insufficiently policy-relevant to be impactful. Research rarely integrates the complexity of real-world systems, including multiple and dynamic impacts of strategies, and consideration of how decision-making processes contend with competing interests and short-term electoral cycles. Due to siloed-thinking and restrictive funding opportunities, research often falls short of the type of evidence that would be most useful for decision-making, and research outputs can be cryptic to decision makers. As a way forward, we urge researchers and stakeholders to engage in co-production and systems thinking approaches. Partnering across sectors and disciplines is urgently needed so pathways to climate change mitigation and adaptation fully embrace their health-promoting potential and engage society towards the huge transformations needed. This commentary is endorsed by the International Society for Environmental Epidemiology (ISEE) and the International Society for Urban Health (ISUH) and accompanies a sister statement oriented towards stakeholders (published on the societies’ websites). Keywords: climate change; co-benefits; systems thinking; co-production; cities 1. Climate and Health—Missed Opportunities for Synergies The frequency, intensity and severity of extreme weather events are rapidly increasing and are projected to continue rising unless humanity takes strong and immediate action. The public health impacts of climate change are widely acknowledged in research [1]. Int. J. Environ. Res. Public Health 2021, 18, 12516. https://doi.org/10.3390/ijerph182312516 https://www.mdpi.com/journal/ijerph