Passengers take water from a water tap during a hot day at...

ALLAHABAD, UTTAR PRADESH, INDIA - 2015/06/08: Passengers take water from a water tap during a hot day at the Allahabad junction. The death toll from the blistering heat wave in India exceeded 2,500 on Sunday as weather officials said the sweltering conditions would persist for another four or five days. Pre-monsoon showers late last week in Andhra Pradesh and Telangana states in south India, where the bulk of casualties have occurred, provided some relief as daytime temperatures dropped to normal average levels. But the region remained in the heat waves grip on Sunday as temperatures hovered between 108 and 113 degrees Fahrenheit, authorities said. (Photo by Prabhat Kumar Verma/Pacific Press/LightRocket via Getty Images)