U.S. data on climate still emphasize that the average global temperature for 2011 was the 11th warmest on record.
The National Oceanic and Atmospheric Administration of the United States (NOAA) has calculated that the average temperature was 14.3 degrees Celsius. This is an increase of 0.5 degrees Celsius above the average recorded for the twentieth century. The year 2011 has been even warmer than any other year of the last century, with the exception of 1998.
Last year was the second coldest of the century. One reason for this warmth in 2011 is the phenomenon El Nino, which cools the center of the Pacific Ocean.
This is the 35th consecutive year that we denote global temperatures higher than normal. The NOAA data back to 1880.
Two years ago, 2010, tied for the hottest on record.
NASA scientist James Hansen and Andrew Weaver said they expect that in the next few years the world will set yet a new record high temperature.