而硫酸盐微粒方案只能在短暂的几年内有效。
Sulphate particles, meanwhile, survive only a few years in the atmosphere.
1991年，菲律宾的品纳士玻火山爆发不到一年，上层大气中的自然硫酸盐微粒就使全球气温降低了0.5摄氏度。
Natural sulphate particles in the upper atmosphere lowered global temperatures by 0.5 degrees Celsius in less than a year following the eruption of Mount Pinatubo in the Philippines in 1991.
在那里，气态硫转化为可以反射阳光并令地球冷却的硫酸盐悬浮微粒。
There, the sulfur gas transforms into a sulfate aerosol that reflects sunlight and cools the planet.
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