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And they enthusiastically support plans for another pipeline , to deliver the huge natural gas reserves locked in the Arctic . At least half the summer sea ice in the Arctic is projected to melt by the end of this century , along with a significant portion of the Greenland Ice Sheet , as the region is projected to warm an additional 4-7 C ( 7 to 13 F ) by 2100 . Its marine environment sustains a wide range of marine mammals , such as seals and whales , at far greater levels than are found in the Arctic region . The barred zone in the Arctic Ocean continues as such until the conclusion of a general peace . Using the best available estimates of global emissions of gases that produce ozone , the GISS computer model study reveals how much this single air pollutant , and greenhouse gas , has contributed to warming in specific regions of the world.According to this new research , ozone was responsible for one-third to half of the observed warming trend in the Arctic during winter and spring .