feeds/tech+feeds/techvideo: Global warming study suggests human causes dating back to 1800s

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Global warming study suggests human causes dating back to 1800s Apr 22nd 2013, 23:25 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. The records show variations in temperature caused... Media files: 6C7050733-john-roachED617827-648B-AA56-37B4-828AE0239F58.standard.jpg

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