"'The global temperature for the year 2013 is consistent with a long-term warming trend,' World Meteorological Organisation (WMO) chief Michel Jarraud said in a statement. Last year tied 2007 as the sixth warmest year since records began in 1850, with a global land and ocean surface temperature that was 0.5 degrees Celsius (0.9 degrees Fahrenheit) above the 1961-1990 average, the WMO said."