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Wildfire smoke claims more than 33,000 lives each year, new study finds

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Wildfires are no longer local affairs. Smoke from California has colored sunsets in New York, Australian bushfires have polluted Santiago, Chile, and people in Vancouver have inhaled the burnt remnants of Siberian forests. As a byproduct of these megafires, the world is watching a natural experiment in the effects of exposing a significant portion of the global population to wildfire smoke.

Researchers are starting to see just how much damage this pollution is doing. A team of more than 70 scientists from all around the world tallied up the death toll in a first-of-its-kind study published Wednesday in the journal Lancet Planet Health. Their estimate? Smoke from the world's worsening wildfires is now killing 33,510 people every year.

It's important to know this number because if societies don't react, it's likely to grow worse, said Yuming Guo, a biostatician at Australia's Monash........

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