Berlin, Jan 11 : Scientists have determined that the observed increase of warm years after 1990 is not a statistical accident as has been claimed by some climate skeptics.
Scientists at the GKSS Research Centre of Geesthacht in Germany and the University of Bern in Switzerland have investigated the frequency of warmer than average years between 1880 and 2006 for the first time.
Between 1880 and 2006 the average global annual temperature was about 15 degrees Celsius. However, in the years after 1990, the frequency of years when this average value was exceeded increased.
The researchers' result indicated that the observed increase of warm years after 1990 is not a statistical accident.