Heatwaves kill more people in most years than any other natural hazard — and the risk concentrates almost entirely among those with the least capacity to escape it.
Unlike a hurricane or earthquake, extreme heat leaves no visible wreckage, which makes it easy to undercount as a disaster. But dense urban cores — with more concrete, less tree cover, and less airflow than surrounding areas — can run several degrees hotter than nearby suburbs, an effect known as the urban heat island.
The people most exposed are also often the least equipped to respond: older adults living alone, outdoor workers, and low-income households without reliable air conditioning. Cities that have made real progress treat heat as seriously as they treat flooding — with named heat officers, cooling centers, and outreach that checks on isolated residents during a heatwave rather than after it.
Nature based interventions matter here too: expanded urban tree canopy and reflective roofing materials measurably lower street-level temperatures. Heat resilience is ultimately an equity question as much as an engineering one — the neighborhoods hottest today are frequently the same ones with the fewest resources to cool down.