‘A calamity’: Why is a record heatwave sweeping South Asia?

A record-breaking, deadly heatwave sweeping South Asia has pushed temperatures to dangerous highs, disrupting daily life for hundreds of millions and raising new concerns about the vulnerability of one of the world’s most densely populated regions. Countries including India, Pakistan and Bangladesh have seen temperatures soar well above seasonal averages, with some areas approaching or exceeding 45-50 degrees Celsius (113-122 degrees Fahrenheit). …