The project, consisting of Phases 1 and 2, will produce decision-making tools that optimize tree canopy coverage in desert cities. It will balance three central concerns: tempering the effects of heat on health and well-being, water consumption, and environmental justice (equitable benefits of water devoted to trees). These effects pull in different directions, so end-user-oriented decision-making tools will help decision-makers at multiple scales, from householders to community organizations to city and county planners. The overall deliverables for this project are to produce decision-making tools for stakeholders to select and distribute trees while optimizing justice and effectiveness in water-heat tradeoffs. In Phase 1, the team will develop, test, and deliver use-inspired prototype tools, driven by the convergence of community partner discussions with key research questions about urban trees, water, heat, and social equity. Phase 1 components include: tree selection and distribution decision-making tools for planners in desert cities; use of thermal data to assess tree water-heat-health tradeoffs; fine resolution environmental justice mapping of tree benefits and costs, especially water; improvement of software for assessing household energy and water conservation measures with focus on trees; and community health worker training programs for household and neighborhood tree planning. The project will use the large, arid, and relatively low income/high Hispanic city of El Paso as its test bed.