Sulphur in the stratosphere, a natural result of volcanic eruptions, provides a lot more cooling per tonne than the coal-emitted sort.

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。

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Mimics the cooling effects of a volcanic eruption by spraying shiny sulphur compounds into the high atmosphere.

这种方法通过对高层大气喷洒闪光的硫化物模仿火山爆发的降温效果。

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Nature has already shown that this concept can work, since volcanic eruptions that send sulphur-rich plumes into the stratosphere can temporarily alter the world’s climate.

（一些自然现象已经证实这一构想的正确，例如在火山喷发的时候，富含大量硫酸盐的烟流被送向平流层，从而暂时的改变全球气候）。

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Injecting sulphate particles into the stratosphere, for instance, would cool the Earth by reflecting more sunlight into space. (Nature has already shown that this concept can work, since volcanic eruptions that send sulphur-rich plumes into the stratosphere can temporarily alter the world's climate.) However, Dr Lenton notes that the method becomes less effective as the atmosphere becomes more saturated with particles.

ECONOMIST: Geo-engineering