These heat waves, occurring over the last several decades, have caused the greatest number of deaths, according to world meterorological organizations.
Deadliest Heat Waves
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In this 2003 file photo, the Ibardin lake in southern French was almost dry due to a heat wave that killed 71,000 people, making it the most deadly heat wave in the world to date.
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A heat wave in Russia in 2010 left more than 55,000 people dead.
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In 2006, Europe had about 3,418 deaths directly attribed to the heat wave.
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In 1998, about 2,541 deaths in India were attributed to the heat wave.
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An Indian auto rickshaw driver rests on a hot summer day in Hyderabad, India, May 25, 2015. So far, more than 1,826 deaths have been attributed to the heat wave.