For anyone who doubts humanity's power to alter our planet

One man was responsible for events that altered the earths enviroment in the 13th century, albeit slightly. The environmental impact of Genghis Khan’s conquests could be considered history’s first large-scale "man-made" carbon sequestration event. As the Mongol Empire expanded, the resulting depopulation led to the abandonment of millions of acres of agricultural land. In regions like China and Persia, the natural landscape reclaimed these fields, allowing massive forests to regrow over roughly a century. This surge in biomass scrubbed approximately 700 million tons of carbon from the atmosphere, measurably cooling the planet. It took the deaths of an estimated 40 million people to do it though.
 
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