Poor nations to suffer more than biggest polluters

The report doesn't say how many people will be affected by the additional dangerously hot days, but coauthor Friederike Otto of Imperial College London said "it will definitely be tens of thousands or millions, not less." She noted that thousands die in heat waves each year already.

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Thursday's study calculated that the week-long southern Europe heat wave in 2023 is now 70% more likely and 0.6°C warmer than it would have been 10 years ago when the Paris agreement was signed.

And if the world's climate-fighting efforts don't increase, a similar heat wave at the end of the century could be 3°C hotter, the report estimated.

A heat wave similar to last year's US and Mexico heat wave could be 1.7°C hotter by the end of the century under the current carbon pollution trajectory, the report said.