FILE - A security guard wearing an electric fan on his neck wipes his sweat on a hot day in Beijing, July 3, 2023. Climate change is making heat waves crawl slower across the globe and last longer with higher temperatures over larger areas, a new study finds. 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.
From 1979 to 1983, global heat waves would last eight days on average, but by 2016 to 2020 that was up to 12 days, the study said. Just like in an oven, the longer the heat lasts, the more something cooks. In this case it's people, the co-authors said. The study also looks at the changes in weather patterns that propagate heat waves. Atmospheric waves that move weather systems along, such as the jet stream, are weakening, so they are not moving heat waves along as quickly — west to east in most but not all continents, Zhang said.
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