Intolerable bouts of extreme humidity and heat which could threaten human survival are on the rise across the world, suggesting that worst-case scenario warnings about the consequences of global heating are already occurring, a new study has revealed.

Scientists have identified thousands of previously undetected outbreaks of the deadly weather combination in parts of Asia, Africa, Australia, South America and North America, including several hotspots along the US Gulf coast.

Humidity is more dangerous than dry heat alone because it impairs sweating – the body’s life-saving natural cooling system.

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