Study: Climate Change Makes Heat Waves Last Longer, Spike Hotter, Hurt More People

FILE - A man cools off from during a heat wave under an open-air shower in Baghdad, July, 6, 2023. FILE - A sign displays an unofficial temperature as jets taxi at Sky Harbor International Airport at dusk, July 12, 2023, in Phoenix.

Climate change is making giant heat waves crawl slower across the globe, and they are baking more people for a longer time with higher temperatures over larger areas, a new study finds.