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News Release 13-072
Analysis of 2,000 Years of Climate Records Finds Global Cooling Trend Ended in the 19th Century
20th-century warming, researchers say, "reversed" the trend
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![Student researchers in a boat use acoustic imaging to select a lake site](/news/mmg/media/images/climatecooling1_f.jpg)
Students use acoustic imaging to select a coring site at a lake in southern Alaska.
Credit: Darrell S. Kaufmann, Northern Arizona University
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![Female gradute student examines lake sediment core from southern Alaska](/news/mmg/media/images/climatecooling2_f.jpg)
Examination of lake sediment core from southern Alaska shows intricate layering indicating environmental and climatic changes over centuries.
Credit: Darrell S. Kaufman, Northern Arizona University
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