"When the toxic cloud falls down, it ACTS like acid rain, damaging plants and monuments," Ribeiro added.

“当毒云落下，它就像酸雨一样，破坏着植物和古迹，”里贝罗补充说。

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To their surprise, they discovered that the seed-formation rates for sulphuric acid and ammonia are between a tenth and a thousandth of those needed to account for the cloud seeding actually seen in the atmosphere.

ECONOMIST: Climate science (II)