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。
2
It is not known whether his insanity was due to natural causes, or to misuse of alchemical "remedies" - which often included toxic materials like sulphur, lead, mercury, arsenic, and antimony.