‘Like caring for a pet’: the open-source tree map inspiring Berliners to water their urban forest

<p>Gieß den Kiez app shows trees in critical need of watering and can be adopted by other heat-stressed cities around the world</p><p>Amanda Gläser-Bligh sometimes attracts puzzled looks when she goes to water the eight-year-old street tree she has adopted outside her door in Charl