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  • captain_zee captain_zee Apr 10, 2013 6:20 PM Flag

    Northern Summers Warmest in Past 600 Years, Study Says


    Northern Summers Warmest in Past 600 Years, Study Says

    By Justin Doom - Apr 10, 2013 12:00 PM CT.
    Half of the last eight summers in cold regions including parts of Greenland and Russia have been the warmest since 1400, according to a Harvard University study on climate change across high northern latitudes.

    The findings, published in the journal Nature, showed that the summers 2005, 2007, 2010 and 2011 were hotter than any point in the previous 600 years. Average temperatures over the last 20 years in those regions rose by about 1.16 degrees Celsius (2 degrees Fahrenheit), said Martin P. Tingley, a Harvard research associate and the study’s lead author.

    Tingley and coauthor Peter Huybers used a statistical technique called hierarchical Bayesian analysis to crunch data that included tree-ring density, lake sediments and ice cores from Greenland and the Canadian Arctic. The approach produced a more precise result than previous long-range temperature reconstructions. The more rigorous method reduces controversy and means “more people will start paying attention” to climate change, he said.

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