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Last year tied for the sixth hottest on record, confirming that Earth's climate is in the grip of long-term warming, the UN's weather agency said.today. "The global temperature for the year 2013 is consistent with the long-term warming trend," World Meteorological Organization (WMO) chief Michel Jarraud said in a statement. Last year equalled 2007 as the sixth warmest year since reliable records began in 1850, with a global land and ocean surface temperature that was 0.5 degrees Celsius above the 1961-1990 average, the WMO said. Temperatures in both years were also 0.03 degrees Celsius above the average from 2001-2010, which in turn was an extremely hot decade, with 2005 and 2010 topping the warming charts.