This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
AreaPerCapita BC to AD. Graph of one over estimated human population of the World from BC to AD br development in available land area or any other constant resource per capita Note the almost linear decrease over the last years pointing towards zero in the near future br the available space per capita could further decline