"Layers of sediment provided a proxy for temperatures: thicker layers indicated higher temperatures as water from melting glaciers pushed mud into the lakes, while thinner layers indicated less melting.
All three data sources told the same story -- that the Arctic began to warm at the beginning of the Industrial Age in the mid-1800s, when humans began releasing large quantities of carbon dioxide into the atmosphere."
Find the entire article here: http://www.latimes.com/news/nationworld/nation/la-sci-arctic5-2009sep05,0,3388515.story
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