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Global increase of warmer years is no accident
A statistical analysis was performed of the mean global temperature for every year between 1880 and 2006 to determine if the presence of 13 years with temperatures above the average of 15C is just a statistical fluke. They determined that there is a 1:10,000 chance (which means extremely unlikely) that recent warm years were due to chance rather than some influence factor. The study made no claims about what the influence factor could be, but agree that the most likely cause is the presence of greenhouse gasses.
