Global warming greatest in past decade

Researchers confirm that surface temperatures in the Northern Hemisphere were warmer over the last 10 years than any time during the last 1,300 years, and, if the climate scientists include the somewhat controversial data derived from tree-ring records, the warming is anomalous for at least 1,700 years.

The proxies used by the researchers included information from marine and lake sediment cores, ice cores, coral cores and tree rings.

The study is published in the Proceedings of the National Academy of Sciences and is enclosed herewith.