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With climate change, the increase in exposure to extreme heat in urban areas is likely to have an impact on people living in large cities, especially the poorest.

The topic, already well-documented, is set out very precisely in a report published in the American journal PNAS (Global urban population exposure to extreme heat) in October 2021.

Of the 13,115 cities examined, the number of person-days per year of exposure to extreme heat (the number of days per year that exceed a heat exposure threshold multiplied by the total urban population exposed) increased from 40 billion in 1983 to 119 billion in 2016.

The excessive heat affecting populations and infrastructure is compounded by pollution and extreme events like torrential rain, landslides and storms.

Some cities have decided to take action in order to protect themselves against the consequences of climate change. These adaptation strategies can be a source of inspiration for cities worldwide.