最远的北方冻土区也开始有了变化，从最大的温室气体储藏室变成了最大的温室气体源头。
The frozen soils of the far north are already changing—from a tremendous storehouse of greenhouse gases to a tremendous source.
因为太阳是光，能量和热的源头，太阳光照强度和密度的变化带来了春夏秋冬季节的改变。
Because the sun is our source of light, energy and heat, the changing intensity and concentration of its rays give rise to the seasons of winter, spring, summer and fall.
它做为全球气候变化的源头，也是海洋双层循环最为活跃的地区。
North Atlantic is the source areas of the global climate change, which is the most active area of sea circulation.
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