The number of extremely hot days every year when the temperature reaches 50C has doubled since the 1980s, a global BBC analysis has found.
They also now happen in more areas of the world than before.
The total number of days above 50C (122F) has increased in each decade since 1980.
"The increase can be 100% attributed to the burning of fossil fuels," says Dr Friederike Otto, associate director of the Environmental Change Institute at the University of Oxford.
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