Whenever you see the word root anthro, you can bet there’s a person involved, and anthropogenic is a particularly good example. From the Greek anthropogenes, meaning "born of man,” anthropogenic can refer to any changes in nature that are caused by people — like the existence of roads or cities where once there were forests. Most often, you will hear anthropogenic as an adjective describing pollution — such as the anthropogenic causes of the hole in the ozone layer.