A punishing drought is draining Europe’s great rivers, pushing the Loire, the Danube and the Rhine towards record lows. At the Kaub gauging station, the reference point for shipping on the Rhine – Germany’s economic artery – the water level fell to 17cm (6.7 inches) this month, a low unseen since measurements began in 1880.Meanwhile, wildfires are burning across southern Europe, forcing the evacuation of hundreds of thousands and producing the defining image of a European summer in which...