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Summer’s silent killer: why the world’s heatwaves are a global health emergency

By Ian Williams, Professor of Applied Environmental Science, University of Southampton

Heat is no longer a future climate risk. It is already here.

Across continents, high temperatures are being pushed higher by forces acting at once: human-caused warming, very warm oceans, dry soils, slow-moving high-pressure weather systems and El Niño conditions that have now developed in the tropical Pacific.

El Niño is a natural warming of part of the tropical Pacific that can…

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