Well, there was always Temujin a.k.a. Ghenghis Khan that may have scrubbed quite a bit more CO2 from the atmosphere. [1] It has concluded that the 13th-century

Well, there was always Temujin a.k.a. Ghenghis Khan that may have scrubbed quite a bit more CO2 from the atmosphere. [1] It has concluded that the 13th-century Mongol leader's bloody advance, laying waste to vast swaths of territory and wiping out entire civilisations en route, may have scrubbed 700m tonnes of carbon from the atmosphere – roughly the quantity of carbon dioxide generated in a year through global petrol consumption – by allowing previously populated and cultivated land to return to carbon-absorbing forest. [1] - https://www.theguardian.com/theguardian/2011/jan/26/genghis-khan-eco-warrior https://www.theguardian.com/theguardian/2011/jan/26/genghis-...