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Understanding Climate Change, With Help From Thoreau

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Researchers in Massachusetts and Wisconsin are comparing modern flower blooming data with notes made by Henry David Thoreau and Aldo Leopold. The sight of irises blooming during a Boston winter helped spur the research. (Darlyne A. Murawski/Getty Images/National Geographic Creative)
Researchers in Massachusetts and Wisconsin are comparing modern flower blooming data with notes made by Henry David Thoreau and Aldo Leopold. The sight of irises blooming during a Boston winter helped spur the research. (Darlyne A. Murawski/Getty Images/National Geographic Creative)

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