Local weather change: big improve in city warmth publicity since 1983



Riyadh, Saudi Arabia

Mohamed Hussain Younis / EyeEm / Getty Images

Extreme heat has been a far greater challenge for urban populations around the world over the past 40 years.

Cities are vulnerable to heat because of both climate change and something called the urban heat island effect – a phenomenon where urban areas are much hotter than surrounding rural regions due to their higher concentration of built infrastructure and human activities.

Cascade Tuholske at the University of California, Santa Barbara, and his colleagues used worldwide urban population data combined with global fine-resolution maximum air temperature and relative humidity …