1.Area of the Arctic ice to an average of 2.7 percent per decade to reduce the speed.Summer to reduce the total glacier area extent of 7.4%.
2.Since the 80's since the 20th century,permafrost surface temperature has increased by about 3 ℃.
3.Since the 1900s onwards,led to sea-level rise of 4-6 meters.
4.Fossil fuel emissions of carbon dioxide from the 20th century,an average of 90 years to 6.4 billion tons of carbon between 2000-2005 at an average annual 720 million tons of carbon.