From 1961 to 2006, polar vortex area in the northern hemisphere decreased, and the polar vortex area index was positively correlated with the number of stong wind days.
1961年到2006年,北半球极涡面积呈减少趋势,极涡面积指数与东北地区大风日数呈正相关。
参考来源 - 中国东北地区风的气候变化特征及大风的成因研究·2,447,543篇论文数据，部分数据来源于NoteExpress
Which makes earth, and in particular, the northern hemisphere, warmer.
这使得地球变暖了，尤其是北半球地区。
Most of the fuel is burnt in the northern hemisphere, where temperatures seem to be falling.
大部分燃料是在北半球燃烧的，那里的温度似乎正在下降。
Most of the fuel is burnt in the northern hemisphere, where temperatures seem to be falling.
大部分燃料是在北半球燃烧的，那里的温度似乎正在下降。
Yet some sea ice in the Arctic melts each year during summer in the Northern Hemisphere.
VOA: special.2009.10.27
For those of us in the northern hemisphere, Monday is the first day of Winter, which seems a good time to check out a website that's all about the snow.
VOA: standard.2009.12.19
U.S.officials worry that, even if the virus' spread is eventually contained, it could re-emerge months from now during the northern hemisphere's winter flu season, when more than 30,000 Americans die each year from common influenza.
VOA: standard.2009.05.03
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