This graph depicts the warming trend of the average annual global temperature. The average temperature around the globe in 2011 was almost a degree warmer than it was 50 years ago. The global average surface temperature in 2011 was the ninth warmest since 1880. Global surface temperatures in 2010 tied 2005 as the warmest on record. Nine of the 10 warmest years in the modern meteorological record have occurred since the year 2000. Higher temperatures today are largely sustained by increased atmospheric concentrations of heat-trapping greenhouse gases, especially carbon dioxide.