How many people did Genghis Khan kill? So many that it was good for the environment

When the Nazis drew their bloody path through Europe, they claimed that it was for cleaning the lands of those unworthy. All the millions of deaths had only one objective – to make the rest of humanity stronger. All it did was wreck a big part of the more developed world and bring unbelievable suffering to humanity. Nazi ideology has been rightfully put into the evil camp. How about the green cleansers? I have heard many calls for the reduction of humanity for the sake of saving the planet. To me, this is about as distasteful as the Nazis were. Where would they want to start the culling? Will they want concentration camps? Just asking. 

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