In 2019, extreme heat claimed almost a thousand lives a day worldwide. And that number will grow. If the world cannot limit planetary temperature increase by just 1.5°C by 2100 − a target agreed by 195 countries − then deaths in heat waves will become substantial. That’s the verdict of a careful study in one of the world’s oldest and most distinguished medical journals, The Lancet, which warns that almost half the world’s population and more than one billion workers are already exposed to episodes of extreme heat: more than a third of those workers already have what the scientists called “negative health effects.” Helpfully, the researchers list these effects. They include “an increased risk of hyperthermia and cardiovascular failure or collapse, and increased risk of acute kidney disease.” The researchers also looked at almost 65 million records of causes of death in nine nations to identify at least 17 conditions linked to heat-related death: ischaemic heart disease, stroke, cardiomyopathy and myocarditis, hypertensive heart disease, diabetes, chronic kidney disease, lower respiratory infection and chronic obstructive pulmonary disease.
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