如果没有这些大量冷却的海冰，被带到北极的暖空气可以比以前更深入渗透到内陆。
Without those masses of cooling sea ice, warm air brought to the Arctic can penetrate further inland than it ever did before.
更长的生存期就意味着就每克的冷却量而言，平流层中的硫比底层的硫多约25倍。
This longer life means that in terms of cooling per gram, sulphur in the stratosphere outdoes the lower-down stuff by about 25 to 1.
平流层的硫是火山喷发的自然结果，这种硫每吨比燃烧煤释放的硫能造成更强的冷却效应。
Sulphur in the stratosphere, a natural result of volcanic eruptions, provides a lot more cooling per tonne than the coal-emitted sort.
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