A record-setting and deadly heatwave sweeping across South Asia has driven temperatures to perilous levels, disrupting everyday life for hundreds of millions of people and intensifying concerns about the fragility of one of the world’s most densely populated regions. India, Pakistan and Bangladesh are among the countries experiencing temperatures far above seasonal norms, with some areas nearing or surpassing 45-50 degrees Celsius (113-122 degrees Fahrenheit). Recommended Stories • list 1 of