David Battisti, University of Washington

As global temperatures rise, people in the tropics, including places like India and Africa’s Sahel region, will likely face dangerously hot conditions almost daily by the end of the century – even as the world reduces its greenhouse gas emissions, a new study shows.

The mid-latitudes, including the U.S., will also face increasing risks. There, the number of dangerously hot days, marked by temperatures and humidity high enough to cause heat exhaustion, is projected to double by the 2050s and continue to rise.

In the study, scientists looked at population growth, economic development patterns, energy choices and climate models to project how heat index levels – the combination of heat and humidity – will change over time. We asked University of Washington atmospheric scientist David Battisti, a co-author of the study, published Aug. 25, 2022, to explain the findings and what they mean for humans around the world. Continue reading →