Genghis Khan has been branded the greenest invader in history - after his murderous conquests killed so many people that huge swathes of cultivated land returned to forest.
The Mongol leader, who established a vast empire between the 13th and 14th centuries, helped remove nearly 700million tons of carbon from the atmosphere, claims a new study.
The deaths of 40million people meant that large areas of cultivated land grew thick once again with trees, which absorb carbon dioxide from the atmosphere.
And, although his methods may be difficult for environmentalists to accept, ecologists believe it may be the first ever case of successful manmade global cooling.
It's a common misconception that the human impact on climate began with the large-scale burning of coal and oil in the industrial era,’ said Julia Pongratz, who headed the research by the Carnegie Institution's Department of Global Ecology.
‘Actually, humans started to influence the environment thousands of years ago by changing the vegetation cover of the Earth's landscapes when we cleared forests for agriculture,’ she told Mongabay.com.
The 700million tons of carbon absorbed as a result of the Mongol empire is about the same produced in a year from the global use of petrol.
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He took 10, gave 100!
So can some humanist now tell me what is so bad about this? O sorry, you;re a humanist and you think humans are more worthy than our environment, I think not.