Indo-Asian News Service: Surface temperatures in the Northern Hemisphere were warmer over the last 10 years than any time during the last 1,300 years, according to a study. If climate scientists include the somewhat controversial data derived from tree-ring records, the warming is anomalous (deviating from the normal or common order) for at least 1,700 years. “Some have argued that tree-ring data is unacceptable for this type of study,” said Michael Mann, associate professor of meteorology and …