长达一个世纪里，由于我们向大气中释放了二氧化碳和其他温室气体，当今全球变暖问题本身不经意间证实了地球工程学。但是皮纳图火山的爆发提供了当今地球工程学潜力的实例。

Modern global warming is itself evidence of inadvertent geoengineering, the result of all that carbon dioxide and other greenhouse gases we've been pumping into the atmosphere for a century or so.

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1991年皮纳图火山爆发时释放了超过20亿多吨的二氧化硫进入大气，致使两年左右气温下降了1度半。

The Mount Pintaubo eruption in 1991 released more than 20 million tons of sulfur dioxide into the atmosphere, causing a drop in temperature by half a degree Celsius for about two years.

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火山爆发可以向大气中的平流层释放大量二氧化硫。

Large eruptions can release huge clouds of sulfur dioxide into the stratosphere.

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