The shrinking of the Arctic ice cap has been astonishing, Orheim said in an interview with Xinhua.
"Ice sheet hit the historical low of 3 million square km duringthe hottest weeks last summer, while it covered 7.5 million squarekm on average before the year 2000, " he said.
"If Norway's average temperature this year equals that in 2007,the ice cap in the Arctic will all melt away, which is highly possible judging from current conditions," Orheim said.According to a UN report last year, the world's average temperature could rise by as much as 6 degrees centigrade by the end of the century, causing serious harm to ecosystems worldwide.
Human activity has been the primary driver of the observed changes in climate. Emissions of the key greenhouse gases -- carbon dioxide, methane and nitrous oxide in the atmosphere resultin the greenhouse effect. Image Above: The Antarctic ice breaker the Snow Dragon, or Xuelong in Chinese, sails on ice-coverd waters near the Antarctic Continent on Tuesday, March 11, 2008. (Xinhua Photo)