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Global Warming is the Greatest in Past Decade
In fact, if the climate scientists include the somewhat controversial data derived from tree-ring records, the warming is anomalous for at least 1700 years.
"Some have argued that tree-ring data is unacceptable for this type of study," said Michael Mann, associate professor of meteorology and geosciences and director of Penn State's Earth System Science Center.
"Now we can eliminate tree rings and still have enough data from other so-called 'proxies' to derive a long-term Northern Hemisphere temperature record," he added.
The proxies used by the researchers included information from marine and lake sediment cores, ice cores, coral cores and tree rings.
According to Mann, "We looked at a much expanded database and our methods are more sophisticated than those used previously."
"Conclusions are less definitive for the Southern Hemisphere and globe, which we attribute to larger uncertainties arising from the sparser available proxy data in the Southern Hemisphere," he added.
The National Research Council suggested revisiting surface temperatures in their "Surface Temperature Reconstructions for the Last 2,000 Years," to include newer data and techniques and confirmed results of a 1990s paper by Mann and colleagues.
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