This spring, a record-breaking heat wave swept through Brazil, triggering fires, exacerbating drought, and testing the country’s energy grid. Fernando Santos, 33, who had been living with Long Covid and postural orthostatic tachycardia syndrome (POTS) since June 2021 and had made some progress in his recovery, began to decline when the heat arrived in Rio de Janeiro. Santos developed chest pain and fatigue so severe that he had to temporarily withdraw from his classes, where he was studying...
