For the wealthy of India, the annual heatwave before the monsoon is inconvenient, especially when water stored in black tanks on the roof becomes too hot to use for a shower. For the poor, however, daytime temperatures approaching 50C in the shade can be fatal. Indian officials have reported about 2,000 heat-related deaths in recent days, many of them in the southern states of Andhra Pradesh and Telangana, with victims succumbing to heatstroke and dehydration and hospitals struggling to cope with a surge of emergency admissions.

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