Enterprising researchers working at the Field Museum in Chicago dusted off a collection of Horned Larks to get a better look at the dirt trapped in their wings.
That’s because these birds, some more than a century in age, together form a unique, physical record of industrial-era air pollution. Using soot that billowed from smokestacks and onto feathers during the factory boom, two University of Chicago graduate students updated estimates of atmospheric soot levels in the early 20th centur
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