Global warming study suggests human causes dating back to 1800s

Publication: NBC News   Date: April 22, 2013   View Article

A long-term global cooling trend ended in the late 19th century, a reversal in temperature that cannot be explained by natural variability alone, according to a new study.

The finding stems from 2,000-year-long continental-scale temperature records inferred from tree rings, ice cores, lake sediments and other so-called proxies from around the world.

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