Inside the gynaecology clinic of Karachi’s largest public hospital, the air felt several degrees hotter. It was only 9:30am on a Friday in late February, and the windowless waiting room was already packed with women jostling for a place to sit, calling nurses for help, and scuffling for an ultrasound. Asiya, 21, was pregnant with her third child. The baby was due in May, when the mercury often crosses 38 degrees Celsius, and humidity soars past 70 per cent , making the heat unbearable. As temperatures rose in the room, Asiya felt nauseated and dizzy. “The heat exhausts me,” she said. “My body feels like lead, I’m barely able to stomach food. I am afraid that my child might be born sick.” Asiya lives in Lyari, one of Karachi’s most densely populated neighbourhoods, with narrow alleys and little to no green space. Inside her home, ventilation is poor and cooling scant. Intense summer heat in her neighbourhood is compounded by power outages that last up to 12 hours a day, shutting down...