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简介：地质学家通过冰核研究发现出距今7万5千年左右，北极出现大气硫含量超标，推断地球遭遇巨大的火山大爆发，最终确定是多巴火山喷发出的硫酸盐所形成的酸云，大气中的酸性物质阻断了90%的阳光，这就是古人类的史前大灾难。收起
史前大灾难 [地理中国] 20111111
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