The urgent need for sustainable solutions in urban development is promoting a shift towards greener cities. Hence, concepts of hydrology, plant physiology, meteorology, and complexity science are increasingly entering into urban planning. This session aims to gather contributions on research, advanced applications, and observations useful for the understanding, modelling, and design of coupled urban-natural systems. Within this general framework, contributions on the following topics are particularly welcome:

- Quantitative assessments of the ecosystem services (e.g., microclimate regulation, reduced stormwater runoff, water quality, carbon storage, biodiversity, etc.) provided by urban green and blue spaces such as green-roofs, street trees, urban parks, green buildings, urban wetlands, etc.
- Monitoring and modeling the environmental, social, and economic benefits of urban vegetation in different contexts (across city sizes, climate regions, etc.);
- New methods for observing and/or simulating water, carbon, nutrient, and energy fluxes in urban areas; including innovative physically-based approaches for modeling the coupled urban-biosphere system;
- Understanding the impacts of urbanization on climate (air and surface temperature, rainfall, air quality, etc.) and water resources (groundwater, rivers, etc.) at multiple spatio-temporal scales;
- Plant physiological responses to urban climatic conditions and their implications for plant adaptability and mortality;
- Nonlinear dynamics, emergent properties, and critical transitions in urban landscapes.