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Ancient pollen and charcoal from Egypt’s Nile Delta reveal that a society busy building pyramids also had to face a changing climate.

“The study geologically demonstrates that when deciphering past climates, pollen and other micro-organisms, such as charcoal, can augment or verify written or archaeological records—or they can serve as the record itself if other information doesn’t exist or is not continuous,” says Benjamin Horton, an associate professor in the department of earth and environmental science at University of Pennsylvania.

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