4 ways humans have changed their environment, know any?

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Insane Asylum Escapee

New member
So, while working on a history paper I came across this. I've looked just about everywhere and can't find anything on it. All I get is ways to be 'green' and whatnot. What I'm asking is; Does anyone know 4 ways *ancient or early(around Egypt or Mesopotamia era)* humans changed their environment?
 
Fertile Crescent. The advent of agriculture and the cutting down of trees dried out the land and started the first massive man made climate change in the area.
 
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