Video courtesy of the NSF.

Proxy Records of Past Climate

Climate scientists use "proxy data" to study climates of the past, before humans with thermometers began keeping temperature records. These "proxies" include tree rings, layers within ice cores pulled from glaciers and ice sheets, growth layers in coral, and layers of sediments from the bottoms of lakes and oceans.

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Last modified September 9, 2010 by Randy Russell.

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