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Please find below a session proposal for the meeting of the ESHS in London September 14-17, 2018.  THE GREEN AND THE DARK SIDE OF ENVIRONMENTAL ISSUES IN CITIES (1850-1930) Crossing urban history of science and urban environmental history, this session focuses on hygiene in the nineteenth century and early twentieth century. These topics have been covered by different scholars through different points of view, but we argue for a change of perspective.            Using comparative methodology between centers and peripheral cities in Europe, we aim to discuss contexts, actors, policies and solutions to face these issues. Were there patterns? Who were the leading actors of the claim for healthier cities - doctors, gardeners, engineers, or others? What were the oppositions between theses multiples actors? Which were the policies to face urban hygiene in Mediterranean cities or in Central and Northern European cities? These are some of the questions that we want to address in this session.            Furthermore, these topics can be analyzed by a multi-scale perspective of unity and disunity. On the geographical macro-scale of Europe were the awareness of environmental and hygiene issues, parallel to the creation of public parks, marked by unity or disunity among European centers and peripheral cities? And, on the city scale, have the actors perceived and conceived the urban environment and healthy measures as united or fragmented in space?            We welcome papers on topics related to these issues which focus on individual or comparative city cases. We encourage papers that connect urban environmental history and urban history of science, which take hygiene and health issues as the point of depart to, for instance, address public gardens and parks, city pests, environmental discussions on fresh air and healthier conditions for children and youth.’ Please, submit your abstract (up to 500 words) until December 4th, 2017 (celia.miralles.buil@gmail.com)Best wishes,Ana Duarte Rodrigues (University of Lisbon)Inês Gomes (University of Lisbon)Celia Miralles Buil (University of Lisbon)