] "We are taking a risk with the global climate," said Paal ] Prestrud, vice-chair of the Arctic Climate Impact ] Assessment (ACIA) report, which says emissions of gases ] from cars, factories and power plants are mostly to ] blame. ] ] The Arctic icecap has shrunk by 15-20 percent in the past ] 30 years and the contraction is likely to accelerate, ] Prestrud said. The Arctic Ocean could be almost ice-free ] in summer by the end of the century. Arctic melt accelerates, governments split |