Heat waves are synonymous with summer for most people. But this summer’s heat has broken records for temperatures and duration. As of late July, Texas had experienced highs over 100° Fahrenheit for more than 30 days straight. China posted its highest temperature ever recorded, and Europe’s heat may surpass last year’s onslaught, when more than 60,000 people may have died due to excessive heat.
The hot, dry weather helped fuel coast-to-coast wildfires in Canada, with smoke spilling south and blanketing the U.S. Midwest and East Coast. For many people, it was their first experience with dangerous air quality caused by wildfires, a plague that has become all too familiar to people in the western United States.
Scientists know that wildfire smoke can harm human health, staff writer Meghan Rosen reports. Tiny particles that can lodge deep in the lungs are a big concern, and smoke can contain chemicals like formaldehyde and benzene. But researchers don’t yet know the long-term effects of being exposed to wildfire smoke intermittently over many years and are now focused on answering that question.
The Northern Hemisphere heat waves are being driven by warmer oceans amped up by climate change plus the return of a natural climate cycle called El Niño, staff writer Nikk Ogasa reports. Another factor is meandering jet streams, which have pinned hot air in place.
I asked Rosen, Ogasa and earth and climate writer Carolyn Gramling the question we at Science News have been asking for a few years now: Is this the year that climate change smacks even the least vulnerable?
When it comes to human capacity to withstand extreme heat and high humidity, “there’s this grim feeling like we’re pushing the limit, except we don’t know what the limit is,” Gramling said. She reported last summer that human heat tolerance may be lower than thought (SN: 8/27/22, p. 6). People are definitely talking and thinking more about it, Ogasa said. And he’s adapting…
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