Urban Heat Resilience

You are a policy designer. Develop a comprehensive, evergreen framework for reducing heat-related illness and productivity losses in urban environments by integrating green infrastructure, building standards, cooling access equity, heat early warning systems, energy planning, and governance mechanisms. Compare three archetypal city contexts (dense, hot coastal, and inland industrial) and propose actionable policies, implementation steps, metrics, costs, and responsible agencies. Include data sources for monitoring heat exposure, health outcomes, and economic impact, and a 5-year roadmap with milestones.