The study’s lead author, Kevin Burke, worked with paleoecologist Dr. John Williams of the University of Wisconsin-Madison to assess the climatic characteristics of several geologic time periods, including the Early Eocene (beginning 56 million years ago), the mid-Pliocene (beginning 3.3 million years ago), the Last Interglacial (beginning 130,000 years ago), the mid-Holocene (beginning 7,000 years ago), the pre-industrial era (beginning in 1750), and the early 20th century.
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