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Heat Is Killing Thousands, and Big Events Have Not Adjusted

SYDNEY — At large events all over the world, the scenes of extreme heat stress are starting to look familiar. Older men, shirts undone, lying down with their eyes closed. Aid tents packed with the unconscious. And lines of the faithful — whether they seek religion, music, ballot boxes or sport — sweating under slivers of shade. The consequences have been dire. At this year’s hajj, the Islamic pilgrimage in Saudi Arabia, at least 1,300 people died as temperatures surpassed 100 degrees Fahrenheit.

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