> The Mongol army under Genghis killed millions of people, but his conquests also facilitated heightened commercial and cultural exchange over an unprecedented geographical area.
>According to a study by the Carnegie Institution for Science's Department of Global Energy, the annihilation of so many human beings and cities under Genghis Khan may have scrubbed as much as 700 million tonnes of carbon from the atmosphere by allowing forests to regrow on previously populated and cultivated land.
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