Climate & Health: A new report warns that urban heat islands are becoming a major health threat in tropical cities, where hot, humid conditions are already stretched by poverty, fast urban growth, and weak cooling infrastructure. El Niño Risk: With a 2026–2027 El Niño expected to intensify heat, officials face the prospect of prolonged extreme temperatures that could endanger millions of vulnerable residents. Local Planning & Costs: The piece explains how concrete and asphalt trap heat and release it slowly, while vegetation and smarter land-use can reduce the “heat island” effect. Early Warning Systems: It points to neighborhood-scale alert tools using thermal and health data as a practical way for authorities to respond faster—if budgets and capacity allow.