At least 16 people have died of heatstroke in southern India so far this summer, officials said on Sunday, as a heatwave grips swathes of the country following official health warnings. India is no stranger to scorching summers but years of scientific research have found climate change is causing heatwaves to become longer, more frequent and more intense. Temperatures in several cities across the country of 1.4 billion people have recently hovered well above 45 degrees Celsius. The deaths were reported in the southern state of Telangana, with revenue minister Ponguleti Srinivasa Reddy calling for “statewide vigilance” to safeguard public health. “The intensity of the heat has reached unprecedented levels” and officials in Telangana should issue advance warnings about precautions to be taken during heatwaves, Reddy’s office said in a statement. Health experts say that extreme heat can lead to dehydration that thickens the blood and, ...