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https://static.ffx.io/images/$zoom_0.51708984375,$multiply_0.7554,$ratio_1.776846,$width_1059,$x_0,$y_76/t_crop_custom/q_86,f_auto/t_smh_no_label_no_age_social_wm/0570153e4df2d7cf8d24c6ab46bf5e280af609f5Studies show a fast-warming Arctic is partly to blame for the increasing frequency of the polar vortex extending its icy grip.