The cement, glass and steel that give shape to urban life have also turned modern cities into dangerous heat sinks. Scorching sunlight gets absorbed, stored and slowly emitted in a bubble of warmth that can push city temperatures as much as 3°C (5.4°F) above the surrounding countryside. This dynamic, combined with the increasingly extreme heat waves produced by climate change, helped drive record-breaking highs in Delhi (49°C) and London (40.2°C) over the past few months. Thousands of citydwellers died in sweltering cities this summer. But even on the hottest days during what will likely be one of the five hottest years in modern history, there are urban neighborhoods that succeed at blunting climate-driven heat waves. Evidence of these effective solutions capable of saving countless lives can be seen from space. Satellite images produced by the European Space Agency , working in part with data from NASA and the US […]