As another heatwave rolled across Europe, the warehouses emptied before the politics could catch up. Air conditioners and fans sold out across Spain, Italy and Germany, most of them Chinese. Fan sales in Spain alone on the retail platform of Alibaba Group Holding (which owns the South China Morning Post) nearly doubled last month while Midea Group’s air-conditioner sales in western Europe surged by over 70 per cent in the first six months of the year. A decade from now, such heatwaves may become...