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This image provided by Carl Fuldner and Shane DuBay show Field Sparrows, from 1906, top, and from 1996, bottom, that are in the The Field Museum collection. Scientists say more than 1,000 dirty stuffed old birds from Midwestern museums are helping them better understand a key global warming particle. Researchers found birds from about 100 years ago showed lots more black carbon, often called soot, than just 20 or 30 years later, and more than scientists had thought. That’s important because black carbon is a potent heat-trapping molecule. (Carl Fuldner and Shane DuBay via AP)

This image provided by Carl Fuldner and Shane DuBay show Field Sparrows, from 1906, top, and from 1996, bottom, that are in the The Field Museum collection. Scientists say more than 1,000 dirty stuffed old birds from Midwestern museums are helping them better understand a key global warming particle. Researchers found birds from about 100 years ago showed lots more black carbon, often called soot, than just 20 or 30 years later, and more than scientists had thought. That’s important because black carbon is a potent heat-trapping molecule. (Carl Fuldner and Shane DuBay via AP)

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