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We know from observations that the Arctic Amplification region is warming at a much faster rate than other parts of the globe( we call Arctic Amplification), the impact of Arctic Amplification is twofold. First, since Arctic Amplification is getting much warmer, when cold air outbreaks occur in North America and Europe/Asia, they aren't as cold as they were decades ago. The second effect( though currently debated in the science community) is that a warmer Arctic Amplification is also making the stratospheric polar vortex weaker on the average.