World average temperature rising
Nasa plots world temperature averages since 1884 revealing a long-term climate warming trend.
Blue shows a temperature difference of -2 degrees Celsius and red a temperature difference of +2C.
The world's temperature will keep rising and it's 21st century
activity that is boosting the thermometer, according to Nasa's Goddard
Institute for Space Studies (GISS).
A visualisation released by GISS in New York, shows the average
global temperature has risen about 0.8 degrees Celsius since 1880.
According to the new analysis, 2012 was one of the hottest on record
with a worldwide average of 14.6C and also the ninth-warmest year since
1880 when record keeping began.
Last year's global average temperature was 14.4C. New Zealand, however, averaged 12.5C.
But the institute reports that each year after 2000 has been among
the 14 warmest years ever and 2012 was the warmest La Nina year yet,
which is unusual as La Nina weather patterns usually result in
lower-than-average global temperatures.
GISS reports 2010 and 2005 ranked as the hottest years on record with the exception of 1998.
Scientists said global temperatures had shown we were experiencing warmer temperatures than ever before.
"What matters is this decade is warmer than the last decade, and
that decade was warmer than the decade before," GISS climatologist Gavin
"The planet is warming. The reason it's warming is because we are
pumping increasing amounts of carbon dioxide into the atmosphere."
Full story and graphics here: