Why heatwaves are so deadly

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Heatwaves are a natural part of the planets weather systems, but climate change means countries across the world are experiencing record-shattering heat year after year. In America heat kills more people than other extreme weather events, like hurricanes, floods and tornadoes. And many countries are unprepared for severe heatwaves. Why are they so deadly, what role does climate change play in increasing their ferocity, and what can be done to reduce the deaths they cause?